Change how EmuHawk handles SRAM

[SuuperW]

1. User can manually load a SRAM file
2. Users can do SRAM "save as"
3. Do not automatically save SRAM when closing/rebooting: ask the user instead, but only if no movie had been started
4. Save on close and "flush save ram" menu item write to whichever file was opened (or "save as"d)
5. Enable AutoSaveRam (the one that saves while playing) by default
6. Disable AutoSaveRam when a movie has been loaded
7. Delete the auto save file whenever SRAM is manually saved (or the user says no to saving on close)

This means EmuHawk will never automatically overwrite any SRAM file, and will not clutter the SRAM folder with files from movies.

I'm not fully happy with this, but I am not sure how to make it better. The dialog asking the user if they want to save on close could probably use a "remember my choice" option. A better flow for loading a ROM with a specific SRAM might be something to implement.

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