Minor Hammer cleanups from CS:GO * No functional changes besides some nullptr checks Fixed potential issues with Hammer (from CS:GO) * CTextureSystem::ReloadMaterialsUsingTexture optimization * Some entities such as info_ladder_dismount get proper colors from FGD * Disallow creating "Auto" visgroup manually Minor cleanups Minor VBSP/VRAD cleanups Hammer/VBSP support for 4 way displacement painting Implement particle picker for Hammer Fixed visual and undo bugs with CMapSweptPlayerHull (func_useableladder)