Integrating changes from K&L Station into common boilerplate

-Updating directory structure
-Moving files/shaders that are commonly useful (VSM/ESM/EVSM shadow mapping, baked skinning, etc)
  -These files haven't been prepped to be used in a common project so they may have broken references
  -Better to move them now and check-in now b/c we're switching to Unreal Engine 4. May never get back to this