Updated and revised documentation

Removed Blender section from The Blender Interface
Changed ordering of Architecture sections
Renamed Engine section to The Engine
Revised The Engine section
Revised Database section
Revised File Structure section
Revised Contributing section
Revised Rasterizer section
Revised Quick Start section
Revised Installation section
Revised Introduction section
Revised README section
Revised Comparison to BGE section
Revised Workflow section
Revised Optimization section
Revised Roadmap section
Minor style change for Database
Rasterizer handles multiple databases
Program sorts by Scene->Mesh when drawing

This reduces state changes and allows for LOD and
instancing to be used simultaneously
Renamed Rasterizer and Program register object
functions