use 3rd party libraries from maven central repository where possible

- applies for ckChangelog and PhotoView
- migrate changelog to support the latest ckChangelog
MediaPlayer: don't reload after sending exit (caused the MP to be opened again)
keep the mediascanner from indexing the picon directory
Bump version / Update Changelog
ZapFragment: cancel async task when pausing
remove old appcompat-v7 library stuff.

Maybe this is what's caused/causes the crashes with the "zap"-feature
for some users
- fix and simplify some layouts

- fix wrong background color of pseudo-list items in the device info
- use android:id/text1/2
- small whitespace cleanups
cleanups
cleanup/simplify some drawables

- use shape drawables instead of 9 patch pngs for cards
- cleanup key_* drawables a bit
fix paddings for card shapes