* Switch from pp2d to citro2d
* Fix various bugs by updating libarchive
* Begin work on translation infrastructure
* Switch to libpng for various improvements
* Fixed race condition in icon scrolling
* Use spritesheets to load sprites marginally faster and use less memory
* Various Readme fixes
* Huge improvements to QR reader speed and screen tearing
* Don't try to preview themes/splashes when there are none
* Prevent playing audio when ndspInit() fails
* Don't wait for audio to load before displaying preview
* Fix bug when shuffle themes didn't have BGM
* Fix bug caused by files not being zeroed out when created
What this commit adds:
* Ability to apply a theme, given a folder
* Extract all .zip files in /Themes/ into a relevant folder
* Get all theme metadata from info.smdh
* Proper unicode handling
What's still needed for initial release:
* Theme shuffling
* GUI
