* Draw background over titlemap
* HIDEBACKGROUND to show titlemap
* Specify NOMUSIC or IGNOREMUSIC (to not change music)
* Linedef execs implemented for tree hierarchy, including bubbling (NOENTERBUBBLE/NOEXITBUBBLE)
* Specify ENTERWIPE and EXITWIPE
* Menuid hierarchy fixes (Control mapping, joystick setup)
* Time attack handling fixes
* Specify custom wipes on runtime for D_Display and P_SetupLevel (for titlemap)
* Allow for forcing and skipping a wipe
* Wipe utility functions F_GetWipeLength and F_WipeExists
Used instead of pLocalPalette when attempting to determine objective truths, such as "the colours of this gif without color profile modification" and "what indicies should this colormap remap to".
Also, made f_wipe.c's paldiv only get calculated once.
