Merge branch 'utility_grid' of https://github.com/OpenGameDevelopers/ZED into window_manager
Merge branch 'unstable' of https://github.com/OpenGameDevelopers/ZED into window_manager
Merge branch 'unstable' of https://github.com/OpenGameDevelopers/ZED into window_manager
Merge branch 'window_manager' of https://github.com/OpenGameDevelopers/ZED into window_manager
|SOURCE|
[Linux::System::Window]
* GetDisplayCount should return the total displays supported on the system
|SOURCE|
[Common::System::Window]
* Added GetCurrentDisplayNumber to get the display number the cursor is
  currently over
[Linux::System::Window]
* GetCurrentDisplayNumber which reads the DISPLAY environment variable
  and extracts the display from it
|MERGE|
unstable into window_manager
|SOURCE|
[PandoraLinux::System::PandoraLinuxWindow]
* Added an EGLContext as a member variable
* EGL is used instead of Xlib to create the window to render to
* As it appears the newer PowerVR drivers from TI have issues with X11 (I'm not
  sure about the specfics), the window is created as a fullscreen window
* Default values are used for the colour format, depth/stencil format, and
  OGLES device capability
* There is minimal error checking for this initial version of EGL integration
* THIS HAS NOT BEEN TESTED ON HARDWARE
|MERGE|
unstable into window_manager
|SOURCE|
[Linux::System::LinuxWindow]
* EnumerateScreenSizes renamed to the correct EnumerateScreens (this was
  changed when it was deemed necessary to create a SCREEN structure)