Move GLInterface around to remove VideoBackends dependency on DolphinWX
UnitTests: make it possible to build tests for code that has global dependencies
VertexLoader: Remove more global state dependencies (this time IndexGenerator and VertexManager)
VertexLoader: Add very basic unit testing to get started
VertexLoader: Add more tests, including a few small benchmarks
Isolate D3D and Software Renderer from wxWidgets code
Merge pull request #5 from lioncash/vertex-loader

Isolate D3D and Software Renderer from wxWidgets code
Merge pull request #716 from delroth/vertex-loader

Make vertex loader testable