FEAT: Activity toggle for randomization

[djarbz]

This was mentioned in #5, but figured it would be a good idea to track separately.

There are a handful of activities that I really enjoy and some that don't really do much for me. It would be nice to be able to disable some activities from being selected randomly.

As far as the UI implementation, maybe a long press on an activity to disable it.
The currently active activity could be green instead of the current read and disabled ones could then be red.

[Amethyst-Sysadmin]

Thanks for the suggestion. This would be tricky to implement with the way settings are currently stored. I do need to come up with a better system for that in general as the current implementation is quite clumsy and has lots of problems like resetting users settings every time we update the app with a new setting and change the DB layout. I'm more likely to look at this feature later on after solving that.

The current activity UI also doesn't really scale and probably already has too many buttons. It might need to be a scrollable list or something more along those lines.