* gtk3: Add base for future Vulkan integration
This PR puts in place the fondation for the future Vulkan integration on
the GTK3 UI.
This also updated SPB to 0.0.3-build14 that fixed a use after free on
XErrorHandler on Linux.
* Address rip's comments
* Merge GLWidget inside GLRenderer
* Clean up and deduplicate renderer implementations
* Address shahil's comments
* Address Ac_K's comments
* Address gdkchan's comments
* gui: Refactoring Part 1
* Fix ProfileDialog.glade path
* Fix Application.Quit assert
* Fix TitleUpdateWindow parent
* Fix TitleUpdate selected item
* Remove extra line in TitleUpdateWindow
* Fix empty assign of Enum.TryParse
* Add Patrons list in the About Window
* update about error messages
