The big code style cleanup

* Format using AOSP code style in Android Studio,
  excluding `Rearrange entries` option.
* Rename static variables to use proper naming scheme
* Remove empty lines

Change-Id: I0d193e35f071bc288050e587b1693844d68865e1

src/org/lineageos/setupwizard/WelcomeActivity.java

@@ -52,7 +52,8 @@ public class WelcomeActivity extends BaseSetupWizardActivity {
     }
 
     @Override
-    public void onBackPressed() {}
+    public void onBackPressed() {
+    }
 
     @Override
     protected int getLayoutResId() {