* Store raw values per rgba in extracolormap_t (no maskcolor or fadecolor)
* Crunched some UINT16/32 into UINT8
* Calculate mask values in R_CreateLightTable
* ifdef out EXTRACOLORMAPLUMPS
* Split R_CreateColormap to R_CreateLightTable
* Replace extra_colormaps array with next/prev pointer chain
* Remove foundcolormaps; instead store lumpnum in extracolormap_t
* Add properties to extracolormap_t for portability
With that, I moved R_CreateColormap2's exclusive software colormap malloc code to R_CreateColormap, and merged the two software-only blocks of code into one. I also disabled any unneeded variables and fixed a preprocessor-related goofup
*Added FLIPX/FLIPY support for multi-patch textures and single-patch textures without holes
*Added FLIPY support for single-patch textures with holes; I'll sort FLIPX support out later