Emu48 for Android

Aug 9, 2020

- If the KML folder does not exist, prompt the user to choose a new KML folder.
- If the memory card file for the port 2 cannot be found, prompt the user to choose a new memory card file.
- Move the KML folder in the JSON settings embedded in the state file because Windows cannot open the state file with KML url longer than 256 byte.
- Prevent auto save before "Open...", "Save As...", etc...
- Fix several issues.