Changes

Fix not showing an error when per-game plugin settings are invalid
Fix settings dialog behavior for plugins not being the same for per-game plugin settings
Add 'restore defaults' button to configuration GUI of paraLLEl and angrylion-rdp-plus
Add 'OpenGL type' option to the settings dialog which allows choosing OpenGL ES
Add dynamic OpenGL ES detection to angrylion-rdp-plus (see ata4/angrylion-rdp-plus#157)
Improve screen size selection by making it editable in the configuration GUI of paraLLEl and angrylion-rdp-plus
Improve letter casing in settings dialog, RMG-Input and RMG-Audio
Improve about dialog
Change 'Miscellaneous' tab name to 'General' and change position in settings dialog
Update GLideN64 and SDL_GameControllerDB

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