Split the Android platform java logic into an Android library module (lib) and an application module (app).

The application module `app` serves double duties of providing the prebuilt Godot binaries ('android_debug.apk', 'android_release.apk') and the Godot custom build template ('android_source.zip').

misc/hooks/pre-commit-clang-format

@@ -86,7 +86,7 @@ do
     if grep -q "thirdparty" <<< $file; then
         continue;
     fi
-    if grep -q "platform/android/java/src/com" <<< $file; then
+    if grep -q "platform/android/java/lib/src/com" <<< $file; then
         continue;
     fi