A lot of changes

* Custom controls:
- Rename classes
- Add Dynamic position calculator for auto scale. TODO: document position variables
* Source code
- Abstracts MainActivity.java to prepare implement custom control.

app/src/main/java/net/kdt/pojavlaunch/JavaGUILauncherActivity.java

@@ -70,7 +70,7 @@ public class JavaGUILauncherActivity extends LoggableActivity {
     }
 
     public void forceClose(View v) {
-        MainActivity.dialogForceClose(this);
+        BaseMainActivity.dialogForceClose(this);
     }
 
     public void openLogOutput(View v) {