This commit adds support for loading cubemap lumps from the disk, several patches and hooks had to be implemented to make this work. Since the game was trying to read the pakfile lump from the BSP file (even when absent), it would read EOF (heavily reduces down map loading performance).
This patch prevents 'fps_max' from being reset in 'CEngine::Frame' if 'sv_cheats' isn't set; this cvar is now bound to the server's tickrate in sdk code to save CPU time.
Added 2 new patches:
* Patch0: Unnecessary loop called from 'CModelLoader::UnloadModel'. This calls a 'nullsub' CMaterialGlue vtable method.
* Patch1: CClientState constructor; Removed due to high mem allocation during init (100MiB+). 'CClientState' is useless on dedicated, and all its feature are thereof disabled.
Valve and Respawn Entertainment forgot a comma in 'g_FieldTypes' causing "FIELD_INTERVAL" and "FIELD_MODELINDEX" to be concatenation. The engine executable patch fixes this problem
The documentation file for all patches applied to 'r5apex.exe' could be found in 'r5dev/resource/patch/r5apex.patch'. This is a text file containing the offset to the patch and its original instructions followed by the new instructions.
