Initial creation fo GLFrameBuffer.
Initial creation of GLRenderBuffer.
Added factory methods for GLFrameBuffer and GLRenderBuffer to GPU.java
Added cached gl (use carefully) and monad bind() to GLTexture.
Incremental implementation of render-to-texture in RenderList.
Removal of deprecated gl_FragColor from FragShader.glsl and
addition of attribute positions.
Incremental implementation of render-to-texture in RenderList.
Trivial implementation of deferred rendering.
Deferred rendering stage made reshape-aware.
Cleanup.
Incremental implementation of depth texture.
Trivial implementation of depth texture.
Migrated fog to deferred stage.
Bugfix: No depth-test in transparencies, migrated render buffers as
common in Renderer.java.
Cleanup.