Added support for BPTC and DXT compressed textures.

Data/Textures/defaultTexture.png

Data/Textures/test2.KTX

src/Engine/AssManRendererConnect.cpp

src/Engine/AssetManager/AssetManager.cpp

src/Engine/AssetManager/TextureDocument.hpp

src/Engine/AssetManager/TextureDocument.inl

src/Engine/Engine.cpp

src/Engine/Renderer/OpenGL.cpp

src/Engine/Renderer/TextureDocument.hpp

src/Engine/Renderer/TextureDocument.inl