Improvements to Find Subreddit

[QuantumBadger]

• [X] Rename to "Find Location"
• [X] Add buttons for quickly jumping to subreddit, user, URL, or post search
• [x] Fix issue with loading spinner sometimes not appearing
• [ ] Make Custom Location a separate menu item again
• [ ] Update migration: Disable "Custom Location" preference if "Find Location" is enabled
• [x] Don't re-download subscriptions (re-use existing database)
• [x] Hide subreddit description and subscriber count for subscriptions
• [ ] Include pinned and history subreddits in the search list
• [x] Hide keyboard when the "Search" button is pressed

[japanesephundroid]

@QuantumBadger whatever it is you did for this I think it sped up the whole app. 👍

Some issues I had with cache loading and the wheel spinning for a long time seem to be gone now. I will report back when I do some more testing but again this fix is great.

[mattdbr]

Re the hiding keyboard improvement - is this not just a matter of adding a searchView.clearFocus(); inside onQueryTextSubmit?

Only problem would be that it doesn't hide keyboard if there's no input (guess depends what the desired behaviour here is)