Add option to reset to app data

[yanokwa]

Sometimes app data can get corrupt and you need to reset. Other times, orgs need to reset the app between deployments.

Add a dialog menu in admin settings to choose from a list of the things (settings, forms, submissions, metadata, databases, .cache, xml.bad, layers, etc) that can be reset.

[max2me]

@lognaturel Should we also clear osmandroid cached tiles? They store them outside of our app folder so that is my only hesitation as to avoid accidentally messing other apps on the device (however unlikely that is).

[lognaturel]

@max2me Yes! That's a great one to add. They're in an odk folder so it would be very unlikely that an other app would use them.

[lognaturel]

No, I got that wrong, you're right, it's just in /osmdroid but I still think it's a good option to have. You can work on the wording to make it super clear - maybe something like "all OSM map tiles from phone"