Experiment editor v_awesomeLvl3 => v_awesomeLvl4.

* Improved modularity again.
* Some renaming and moving done for the code to be more concise and
clear.
* Greatly improved visual style of boxes.
* Many and many bug fixes, improvements and performance optimizations.
* Some features were improved.
* Boxes are added via a special left-hand side toolbox now.