Merge changes Ibfc625f5,I26bd5ff5,I255b92f4,I0eff1efe,Id7827d1b, ... into devel/master

* changes:
  Changed Render::Renderer to use MemoryPoolAllocator
  Migrated Render::Texture to use memory pool
  Changed RenderItem* to RenderItemKey
  Memory pool key uses ptr in 32bit mode
  Changed keys from raw int to templated class
  Convert Renderer ptrs to 32 bit keys
  Changed DiscardQueue to templated class