Initial basic functionality commit

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

.gitignore

@@ -35,6 +35,7 @@
 *.i*86
 *.x86_64
 *.hex
+*.3dsx
 
 # Debug files
 *.dSYM/
@@ -50,3 +51,9 @@ modules.order
 Module.symvers
 Mkfile.old
 dkms.conf
+
+# Information files
+*.smdh
+
+# Build files
+build/