Start index and length + AOSP-style buttons + Recently used tabs

I tested it a bit, it should work fine. I made this feature available only to TextViews.

Signed-off-by: Daniele Ricci <daniele.athome@gmail.com>
Mainly for two reasons. Because the documentation doesn't state that we need to call the super class (as a side note the method is empty) and because a child class of EmojiconGridFragment (that is EmojiconRecentsGridFragment) must not call its superclass method because the behaviour conflicts with its parent class (EmojiconGridFragment). So for "coherence" reasons I removed it also in EmojiconGridFragment.
If you want to insert that line also in the recents fragment, we'll need to remove the current *extends* and make a bare Fragment its new parent.