Use UICommon's game list code on Android

Deduplicates code, and gets rid of some problems the old code had
(such as: bad performance when calling native functions, only one
disc showing up for multi-disc games, Wii banners being low-res,
unnecessarily much effort being needed for adding more metadata).

Source/Android/jni/CMakeLists.txt

@@ -1,4 +1,8 @@
 add_library(main SHARED
+  AndroidCommon/AndroidCommon.cpp
+  AndroidCommon/IDCache.cpp
+  GameList/GameFile.cpp
+  GameList/GameFileCache.cpp
   ButtonManager.cpp
   MainAndroid.cpp
 )