IT-HE RPG Engine Code

Should fix a deadlock in X when using the file picker etc.

Fix stupid bugs in ARM lighting engine

Assembler fixes for AMD64, better ASM integration

Added 'if_key' script command, experimental ARM version of darkness code
AMD64 version to follow

Fixed bug when pressing ESC on a -ve tag number

12-12-10 -Converted map formats to be all-ASCII. There is a size
penalty for this, but it will mean that they can be
version-controlled and diffed if need be. The designs
aren't terribly efficient space-wise but they're not a
disaster either. One of the design constraints was that
it should be possible to merge them together and this
has reduced efficiency somewhat.
Nonetheless, sparse maps with a lot of repeating tiles
and few rooftops or lightings can actually be considerably
smaller than the original binary formats.
There will be some loss of performance, however.

-The map readers are backwards-compatible. The maps will
obviously not load in earlier versions of the program,
though.

-Fixed lots more const-correctness bugs and other warnings

Major 64-bit overhaul. Fixed several major bugs including one where
we were using more wield points than we had.

Change of build target

Initial put from 2009 sourcebase