Eliminate need for EditIntern headers
edit.c: txtar.h and txtoptmenu.h weren't actually needed since none of their definitions were in use. txtfile.h was being used for a single function which is now implemented in save_one_txt(), sharing code with the panic file save function. Accept RISC_OS_PLUS switch (circa RISC OS 3.00) is always true now, and delete some experimental code. Fix bug in panic file saves to Wimp$ScrapDir, the filetype was being derived from bits 20-31 of the load address rather than 8-19. Panic save also changed to use RISC_OSLib style SWI functions rather than _swi and _swix. message.c: Take ownership of the task window defines, same as SrcEdit has for some years. Tested in a RAM install, printing a 2 line BASIC program out. Version 1.70. Tagged as 'Edit-1_70'
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