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The title bar, and the back, close and iconise buttons, are no longer redrawn when a window is resized in just the vertical direction.

All window colours can now be specified in 24-bit colour.

Where a sprite is used to plot the back, close, title, iconise, toggle-size,
adjust-size or scroll arrow icons, the sprite is now plotted using a distorted
translation table, to give the sprites the appearance of being coloured
according to the window colours.

The 3D toolsprite set now has solid titlebar sprites.

The icon bar template now uses the standard title bar colours (this optimises
redraw because of the new border tinting code).

When the toggle-size icon or title bar are to be plotted using solid sprites,
the background is no longer filled in just prior to the event (although this
will still be performed if the relevant sprite is masked). This is to reduce
flicker. Similarly, the erroneous rectangle outlines plotted behind scrollbars
have been removed.

New "TASK"-form Wimp_ForceRedraw reason codes:
  R2 = 0 => redraw whole window border (includes line borders).
  R2 = 8 => redraw iconise button.

Autoscroll update period extended to 12cs to reduce flicker.

Added Wimp_ReadSysInfo 17 to return configured drag-and-drop scroll startup
delay (in cs) because the CMOS storage isn't easy to read.

Identified and bracketed changes from 3.9x responsible for 24-bit icon colours.

defaultfontcolours now works correctly again.

Introduced new icon colour code. This holds icon colours in 24 bits internally
throughout, rather than treating 24-bit colour specifiers as a special case.
This results in the following bugfixes/improvements:
 * 3D faces and moat colours, and slabbed-in action button backgrounds, can
   all be specified in 24-bits
 * fading of icons is now consistent across icon types, and utilises the
   colour range of >16 colour modes
 * 3D borders now get faded along with the rest of the icon
 * action buttons can now contain sprites (background is correct, and sprite
   is not inverted)
 * various cases where anti-aliasing didn't blend in to the background
   correctly are now fixed
 * conventional and 24-bit specifiers now behave equivalently to each other -
   the same colour specified either way behaves the same when faded, used as
   an EOR colour etc. (greys are now always dithered in 1-bpp modes, even if
   specified in 24-bit)
 * behaviour is now the same whether the Wimp font is the system font or a
   fancy font (amazingly, this wasn't always the case)
 * except for 3D icons, if the icon background matches the work area
   background, it is unaffected by fading - so for example, group boxes can now
   be faded correctly

Switched out AutoHourglass (Mike was concerned about the speed hit).

Corrected *Help syntax strings for On/Off configuration options.

Icon bar now jumps to the back of the stack as soon as a window is opened above
it (excluding menus, dialogue boxes and foregroud windows). This is to avoid
the ambiguous situation when the icon bar can be part-way down the window stack.
Improved co-odination between auto-fronting and Shift-F12 behaviour.
Stopped scroll offset overflow during icon bar scroll.
Numerous features made configurable:
  WimpIconBarSpeed
  WimpIconBarAcceleration
  WimpSpritePrecedence
  WimpIconiseButton
  WimpStickyEdges (although not actually implemented yet)
  WimpAutoFrontIconBar
  WimpAutoFrontDelay
  WimpAutoScrollDelay
To make room for these in CMOS, Wimp<Drag|DoubleClick><Delay|Move> and
Wimp<AutoMenu|MenuDrag>Delay options are now stored in a more compressed form
in CMOS - but the *Configure interface is unaltered.

(some are also available in other builds):

* New icon highlighting scheme - hue rotated 180°, photographic negative,
  darkened 25% - suits Ursula icons better.
* Release-button window tools compile-time switch turned on.
* Any "TASK" word cleared on exit from Wimp_OpenWindow, Wimp_GetWindowState,
  Wimp_ForceRedraw and Wimp_CloseDown.
* Child windows are no longer allowed to be opened inside the icon bar.
* Message_IconizeAt generation optimised, and no longer calls non-X SWIs.
* Message_IconsChanged implemented, and switched out on speed grounds.
* Wimp_ReadSysInfo 15 removed, replaced with (new) Wimp_Extend 11.
* Backwindows are now segregated from normal windows. A new category,
  foreground windows, are added, and stay above all other windows. (The error
  box template is updated to make it a foreground window.)
* ROM sprites override RAM sprites (and duplicate RAM sprites are deleted
  during the building of the sprite lookup list, preceding the first sprite
  plot after a sprite pool update).
* Wimp_ReadSysInfo 16 added, to return sprite area pointers in order of
  priority (Wimp_BaseOfSprites retains the ROM/RAM distinction).
* Error box code altered:
  + symbolic names used for offsets into tempworkspace
  + error button text buffer enlarged
  + stretched error buttons now shrink back for next use
  + int_flush_opens called at appropriate points to ensure buttons are seen to
    slab in, and to reduce flicker when redisplaying error box at a different
    width (also fixes some redraw bugs)
  + Cancel button given the R6 type border when it will be activated by Return
    (and is therefore moved to the extreme right in such cases)
  + Escape now always selects the second-right button (unless there's only one
    button!) - this also fixes a bug when there's a single user-defined button
  + keypresses in "xxx may have gone wrong" error boxes are now correctly
    interpreted - previously the buttons available in the underlying box were
    being used to determine the effect of keys
  + maximum number of buttons increased from 4 to 8, and the machine no longer
    crashes when the maximum is exceeded
  + window stretches horizontally to keep error message to 7 lines or less
* Bugfix: opening or creating a window with a minimum x visible area coordinate
  of -1 was leading to any of smearing/flickering/recursive drawing. (This was
  actually due to a failure to recognise which windows' positions had been
  updated.)
* Features merged in from spinner branch Wimp:
  + support for UpCall_MediaSearchEndMessage added
  + control-termination allowed in upcalls (used to require null-termination)
  + escape character switched to default during error box display, then
    switched back again afterwards
* GetRectangle filters are now called with (internal) window handle in R10.
* Autohourglass is deactivated whenever WrchV is invoked. (Also optimised.)
* Action button bugfixes:
  + action buttons now deselect if the pointer is dragged off and a window tool
    is the pressed before all the buttons have been released
  + action buttons now slab in following a long (autorepeating) press on a
    scroll arrow window tool

Added ALIGN directive before watchdog callback label.
Added option to select double-height VDU 4 modes.
Added German resources.
Added necessary options for parallel-port debugging via the PDebugM module.