fonts and non media "thumbnails"

- We now have our own fonts to ensure it looks the same on each device and for full control over the style. Looks quite nice now, but not entirely happy with the title font. Will change later, for now it's ok. 
- We now have filenames and icons showing for non-image files.

Closes #190
Does NOT close #182, even though the branch name suggests this. Be aware. This was a mistake. It however:
Closes #192