New in 0.17:
* Fix 256x256@2/animations name in index.theme
New in 0.16:
* Add hidpi icon directories (e.g. 48x48@2) with scale=2
New in 0.15:
* A new icon subdirectory symbolic/apps is available for symbolic
application icons. It similar to scalable, except it has a target
design size of 16, which is what symbolic icons use.