Allow creating RTs if the texture with the same name is an error texture
Clean up Lua created render targets on level shutdown
Cleanup Lua created bound textures (surface.SetMaterial) on map shutdown
Remove "TODO: Refusing to discard X bytes" message
Would appear with developer 1 referencing map entity lump, the memory is properly purged on map load
Fix HL1 sentry leaving solid barrier on death with keep ragdolls