- Diffuse
- Distance attenuation
- float16/float20 types
- Vertex Shader 'view' output

shader_map was only defined on x86 architectures, but was cleared on shutdown
with no ifdef protection. Ifdef this out so non-x86 architectures can be built.

This brings goodies such as a configurable user interface and
multi-threaded timeline view.

Introduce a shader tracer to allow inspection of input/output values for each processed instruction.

Now supports dumping the current shader and recognizes a larger number of output semantics.

- Config: Add an option for selecting to use shader JIT or interpreter.
- Qt: Add a menu option for enabling/disabling the shader JIT.