Optimize: Reduce redundant material id lookups during map loading. Changed the MPE_SidedefCreate and MPE_PlaneCreate create to accept material ids rather than name strings and updated wadmapconverter to do the lookup once at material registration time. R_CheckMaterialNumForName and R_MaterialNumForName should be optimized anyway but won't affect load speed by an order of magnitude, like this optimization.
Optimize: Reduce redundant material id lookups during map loading. Changed the MPE_SidedefCreate and MPE_PlaneCreate create to accept material ids rather than name strings and updated wadmapconverter to do the lookup once at material registration time.
R_CheckMaterialNumForName and R_MaterialNumForName should be optimized anyway but won't affect load speed by an order of magnitude, like this optimization.