Do nothing if the app is launching its own activity
Cleanup
Fix duplicate log entries when returning to the app
Add filtering options back (whitelist or blacklist)

Since the module now ignores activities launched by and within their own
apps, the blacklist shouldn't cause problems anymore, so I'm adding it
back as the default. The 'None' option isn't needed anymore: it was
originally added so some extra checks can be skipped, but they're now
necessary anyway.
Consistent indentation
Add help
optipng
Add drawables for action bar icons
Use icons for action bar items
Reorder the preferences