Fixes & New View

I managed to fix a few things regarding logic and I also created my own ViewPager container for theme choosing. It's basically an upgraded version of what I have on my other app. Will get working on a vertical one soon.

I also added more fancy animations to the intro (it looks amazing, really) and styled the expader.

(And before you ask, yes I did remember to sync the repo. I synced it just before sending this pull request)