- Make GlCompat static
- Expand InstancedArrays compat to encompass all vertex array ops
- GlVertexArray calls into VertexArray compat layer
- VertexAttributes still use 2 separate interface methods
- Move pipeline code to backend package
- Store compiled programs in FlwPrograms instead of FlwCompiler
- Rename PipelineContext to PipelineProgramKey and remove CullingContext
- Remove PipelineContextSet and CullingContextSet
- Improve quality of dumped sources
- Rename pipeline directory to internal
- Add underscores before more internal GLSL variables
- Remove unnecessary GLSL files
- Make BatchingEngine use a shifting render origin
- Make frustum checks relative to the render origin
- Improve AbstractEntityVisual#isVisible to be closer to vanilla
- Move render origin implementation code to AbstractEngine
