1) Consolidate all of the KeyCachingService interaction into a single
mixin. Activities extend delegates which call through to the mixin.
2) Switch Activity increment/decrement triggers from onStop to onPause
in order to account for some screen locks that don't stop activities.
1) Fix up the whitespace tagging so that it's a little more strict.
2) Don't display whitespace tags that we add to our own messages.
3) Make the tag detection prompt a little more visually pleasing.
