Code conventions for Dusk

Upstream when appropriate

Bug fixes, documentation improvements, code cleanup, etc that also apply to the original decompilation project should preferably be PR'd there.

Properly indicate Dusk-modified code

When modifying original game code (i.e. in decomp) for Dusk's purposes, please clearly delineate such code as being Dusk-specific. Generally, this can be done by using #if TARGET_PC and keeping the original code in place. Use #if AVOID_UB for Undefined Behavior fixes to the original codebase.

Miscellaneous things

• The original codebase makes heavy use of global operator new and similar overloads to allocate into a strict tree of heaps. This would cause many linkage headaches for us, so effectively all uses of new or delete in the original game code have been replaced with JKR_NEW, JKR_DELETE, or similar macros. See JKRHeap.h for the full list.