|SOURCE|
* Moved the Linux implementations of GLExtender and GLShader to the Common
  source directory, with the Linux-specific functionality retained in its
  respective source files
[Common::Arithmetic::Arithmetic]
* Un-commented the SIMDType global variable
* Removed comments about adding SIMD to scalar floating-point functions
[Windows::Renderer::WindowsRendererOGL2]
* Removed ToggleFullscreen (this should be handled in
  ZED::System::WindowsWindow)
* Stubbed-out the AddMaterial and GetMaterial nenber functions
* Removed the redundant window handle and device context, which is provided by
  the ZED::System::WINDOW_DATA structure
* GLExtender implemented as a pointer
* Fixed all references to the window handle and device context to the
  ZED::System::WINDOW_DATA's respective equivalents
* GLExtender constructed using the ZED::System::WINDOW_DATA in the class
[Windows::Renderer::WindowsRendererOGL3]
* TEMPORARILY DISABLED VIA "#if defined NOT_DEFINED" AT TOP OF SOURCE FILE
* THIS NEEDS TO BE RE-IMPLEMENTED
[Windows::Renderer::Camera]
* Removed entire source file, as it's implemented in ZED::Utility