Simplify overcomplicated navigation drawer item layout
Improve IGF item layout

- separate the "bar" in an extra layout file for reusability (as list
  and grid layout use the same)
- optimize View structure
Fix gridview selector

There was no visible feedback on item selection since switching to
AppCompat. This will fix this and adds a ripple for Android 5+.
Fix popup selector

Same thing like the gridview selector in the previous commit.
Merge pull request #293 from d-sko/layout_fixes

Some layout fixes