Standard size plugin icon

icon.png must be 256x256 px according to
http://wiki.xbmc.org/index.php?title=Add-on_development#icon.png
Show higher quality thumbnails
Unescape HTML codes in titles

This currently doesn't work in /infos and I have no idea why.
Merge pull request #1 from ckaenzig/cosmetic-improvements

Cosmetic improvements