move main project files into standard gradle/Android Studio layout

This makes it a lot easier to setup all the testing stuff.  Mostly,
I'm tired of fighting Android Studio's fragility, so I want to remove
as much non-standardness as possible in the hopes of improving that
situation.

closes #534 https://gitlab.com/fdroid/fdroidclient/issues/534

app/src/androidTest/java/mock/MockFDroidResources.java

@@ -0,0 +1,37 @@
+package mock;
+
+import android.content.Context;
+import android.test.mock.MockResources;
+
+import org.fdroid.fdroid.R;
+
+public class MockFDroidResources extends MockResources {
+
+    private Context getStringDelegatingContext;
+
+    public MockFDroidResources(Context getStringDelegatingContext) {
+        this.getStringDelegatingContext = getStringDelegatingContext;
+    }
+
+    @Override
+    public String getString(int id) {
+        return getStringDelegatingContext.getString(id);
+    }
+
+    @Override
+    public int getInteger(int id) {
+        switch (id) {
+            case R.integer.fdroid_repo_inuse:
+                return 1;
+            case R.integer.fdroid_archive_inuse:
+                return 0;
+            case R.integer.fdroid_repo_priority:
+                return 10;
+            case R.integer.fdroid_archive_priority:
+                return 20;
+            default:
+                return 0;
+        }
+    }
+
+}