Effect System Refactor

Some requirements:

• A single FX/HLSL syntax for all platforms.
• Support for multiple constant buffers.
• Support for default parameters.
• Support additional shader stages (Geometry, Hull, and Domain).
• Prepare for support of Compute shaders.
• Uses modern cross-compilers.
• Tools can be used at runtime too.
• Annotation support.

Specific Feature issues will be built from this parent task.