Update the source sets configuration for the app and lib modules to match the default configuration

Both the `app` and `lib` modules had custom source sets configuration originating from the early days of the project. This updates the configuration to match the default Android Studio configuration which will simplify the addition of unit tests and instrumented tests to the project.

Note that for backcompat reasons, some folders (such as the `res` folder in the `app` module) are left as is.

platform/android/java/lib/src/main/AndroidManifest.xml

@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    android:versionCode="1"
+    android:versionName="1.0">
+
+    <application>
+
+        <!-- Records the version of the Godot library -->
+        <meta-data
+            android:name="org.godotengine.library.version"
+            android:value="${godotLibraryVersion}" />
+
+        <service android:name=".GodotDownloaderService" />
+
+        <activity
+            android:name=".utils.ProcessPhoenix"
+            android:theme="@android:style/Theme.Translucent.NoTitleBar"
+            android:process=":phoenix"
+            android:exported="false"
+            />
+
+        <provider
+            android:name="androidx.core.content.FileProvider"
+            android:authorities="${applicationId}.fileprovider"
+            android:exported="false"
+            android:grantUriPermissions="true">
+            <meta-data
+                android:name="android.support.FILE_PROVIDER_PATHS"
+                android:resource="@xml/godot_provider_paths" />
+        </provider>
+
+    </application>
+
+</manifest>

platform/android/java/lib/src/main/aidl/com/android/vending/licensing/ILicenseResultListener.aidl

@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.vending.licensing;
+
+oneway interface ILicenseResultListener {
+  void verifyLicense(int responseCode, String signedData, String signature);
+}

platform/android/java/lib/src/main/aidl/com/android/vending/licensing/ILicensingService.aidl

@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.vending.licensing;
+
+import com.android.vending.licensing.ILicenseResultListener;
+
+oneway interface ILicensingService {
+  void checkLicense(long nonce, String packageName, in ILicenseResultListener listener);
+}

platform/android/java/lib/src/main/java/com/google/android/vending/expansion/downloader/impl/DownloadThread.java

@@ -110,7 +110,7 @@ public class DownloadThread {
      * headers, or destination filename.
      */
     private class StopRequest extends Throwable {
-    	
+
         private static final long serialVersionUID = 6338592678988347973L;
         public int mFinalStatus;
 

platform/android/java/lib/src/main/java/com/google/android/vending/licensing/LicenseChecker.java

@@ -133,7 +133,7 @@ public class LicenseChecker implements ServiceConnection {
      * <p>
      * source string: "com.android.vending.licensing.ILicensingService"
      * <p>
-     * 
+     *
      * @param callback
      */
     public synchronized void checkAccess(LicenseCheckerCallback callback) {