Citro2d switch (#175)

* 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

source/fs.c

@@ -200,4 +200,7 @@ void remake_file(FS_Path path, FS_Archive archive, u32 size)
         FSUSER_DeleteFile(archive, path);
     }
     FSUSER_CreateFile(archive, path, 0, size);
+    char *buf = calloc(size, 1);
+    buf_to_file(size, path, archive, buf);
+    free(buf);
 }