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Munge between internal and external window handles using the same macro the Wimp does for clarity.

Some of the changes were one way only, the use of some RETURN[V[C|S]] macros allows 26 bit version to be created.

Version 0.25. Tagged as 'Filter-0_25'

Detail:
  Doesn't include the faking of post-rectangle filters if not building
    for 26 bit systems any more.
  Assumes that the Wimp doesn't care what the flags are on exit from
    a filter.
Admin:
  Built.

Version 0.23. Tagged as 'Filter-0_23'