Capitalise font name entries
Move Theme header to the top of its Settings category
Add density-dependent image sizing in emote picker

Slightly hacky resize method - fits all emotes into a 32dp-high box,
same width as the grid column, which scales some of the smaller ones
more than others. Scaling everything by a single density factor in code
would be better, but this will do if anyone feels like testing the idea
with people
Merge pull request #282 from baka-kaba/master

Capitalise font names and move Themes header, and bigger emotes