Store saves/ramsaves and emulator settings in database

[djhworld]

Instead of faffing about storing ram saves as files, store them in a database such as SQLITE

Things to consider: -

• How efficient is SQLITE at storing and retrieving BLOBS?
• Size of database will grow in line with the amount of games you play

Also could think about allowing ROMS to be stored in a database too?

[djhworld]

Will also have to think about how the user can maintain items in the database too.....

[djhworld]

RAM saves are now stored in JSON format (with ram data stored as a compressed base64 string).

If I ever consider implementing this, having a JSON string rather than a BLOB does appear to be more favourable

[djhworld]

Also it would be nice if you could have multiple "snapshots" of saves per game, so you can keep the last 5-10 saves or whatever and users can rollback to previous ones if desired