* Update the mupen64plus API headers
* Add the new video extension functions in the opengl wrappers
* Pull new headers from upsteam mupen64plus-core
* Modify CMakeLists.txt
* Add GLideNUI source files
* Expose new MUPENPLUSAPI_GLIDENUI option
* This allows you to compile GLideN64 for mupen64plus with GLideNUI
* NOTE that this only works with front-ends which call PluginConfig
* Move src/windows/Config_windows.cpp to src/GLideNUI/Config_GLideNUI.cpp
* This makes more sense because it's not windows-exclusive anymore
* Add src/GLideNUI/fullscreenresolutions_mupen64plus.cpp
* This allows GLideNUI to enumerate the fullscreen refresh rates and resolutions
* Modify src/Graphics/OpenGLContext/mupen64plus/mupen64plus_DisplayWindow.cpp
* This modification allows mupen64plus with GLideNUI to use the selected fullscreen resolution and refresh rates
* Expose a new PluginConfig function which calls Config_DoConfig()
* NOTE that this only works with front-ends which call this function
* NOTE that this technically breaks the mupen spec
New functions are used for texture library initialization.
GetUserDataPath() returns default folder to search for hi-res texture packs.
GetUserCachePath() returns folder to store texture cache.
Mupen64Plus implementation: use system ConfigGetUserDataPath() and ConfigGetUserCachePath().
Windows implementation: just return FindPluginPath() for both functions.
Note: behaviour of Mupen64Plus changed.
Previously the emulator's folder was default path for hires textures and texture cache.
Now default path is system dependent.
For Windows it will be %HOME%\AppData\Roaming\Mupen64Plus
