Switch from ArcEdit style model to clipboard cut & paste model
edit.c: Register clipboard wimp messages on startup. Mark local functions as static. message.c: Let the task window accept clipboard pastes too. This is tied to the 'Ignore ctrl' menu option. When enabled (default) then ^C ^V are filtered out to for clipboard typing to the task, and filters control characters from the task too (as before). When disabled, ^C ^V are passed raw to the task, and all VDU is displayed raw from the task. Cut & paste can still be performed in the disabled case by using the Edit->Select menu. Messages: Remove TaskInput from Task menu, add clipboard keys to Select menu, add swap case to Select menu. Slim down the Misc menu which was too wide in system font. Update interactive help. Use some more of the escape code tokens in interactive help. Declare the previously secret Ctrl-Shift-F1 hotkey for Expand tabs. Templates: Line use magic search character '\n' in the dialogue. New documentation 'ClipKeys' is a complete survey of the hotkeys for !Edit and !SrcEdit with reference to the RISC OS 3.70 welcome manual and a few hidden ones, compared with the current implementation. Requires RISC_OSLib-5_85. Version 1.72. Tagged as 'Edit-1_72'
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