Merge pull request #243 from LPFaint99/memcard

Add the option to use a folder of gamecube saves instead of a memcard image [issue 6599]
Allow user to quit app with back button.
Merge pull request #529 from sigmabeta/quit-app-with-back

Allow user to quit Android app with back button.
Fixed issue with DSP Dump not closing files.

When dumping the two DSP ROMs to file, if it failed to open one of them, neither will be closed. It should now close any that were opened.
Merge pull request #530 from workhorsy/master

Fixed issue with DSP Dump not closing files.
GCI Folder: correctly identify region of sysmenu