[COMMENTS IN CODE]
 BUG_FIX    known bugs in original code (to be kept that way, but with fix in comments)
 /*         block comments are things to be fixed/checked
 FIX_ME     bad data

[PROBLEMS IN DECOMPILED CODE]
 1xxx       Serious bugs (crash/fault)
 2xxx       Minor bugs (noticeable but can be avoided)
 3xxx       Code issues (incorrect code that still compiles/works)

2000 - Generation of Cathedral/Catacombs is slightly inaccurate
2001 - Some spells don't use any mana or charges when they should
2002 - Some tiles are drawn fully lit when they should be transparent (world.cpp)
2003 - Objects should darken with radius instead of being fully lit
2004 - Some CEL functions were written in ASM and have been disabled (engine.cpp)
2005 - Timed messages are broken and have been disabled (tmsg.cpp)
2006 - Server commands are broken and have been disabled (msgcmd.cpp)

3000 - Critical sections should be constructors using CCritSect
3001 - Function 'DRLG_L4TransFix', decompile and check (Test: seed 2349839 level 13)
3002 - Some code uses macros such as __PAIR__ or __ROL4__, or __int64
3003 - Some functions/structures have incorrect signing (signed/unsigned BYTE)
3004 - Function 'GetLevelMTypes', decompile and check (monster.cpp)
3005 - Function 'SetAutomapView', decompile and check (automap.cpp)
3006 - Function 'engine_draw_automap_pixels', decompile and check (engine.cpp)