MasterEmu

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* Added save state management. See help page in app for details.
* Fixed controller handling - swiping works properly now!
* Added option to fund Mega Drive development via a small in-app purchase.
* Fixed bug with file browser causing it to spam layout errors.
* Upgraded to SDL2 2.0.8.
* Updated minimum Android level to 4.4, and also now building to target latest version also.
* Removed some calls to deprecated APIs.
* Removed MIPS32 and MIPS64 support.