Render callback of block environments is not used - episodic goal not shown.

Currently, we are not showing the episodic goal. The necessary parts in the _render_callback() method (https://collaborating.tuhh.de/ckv0173/Scilab-RL/-/blob/devel/custom_envs/blocks/blocks_env.py#L80) are commented and an additional comment states "We don't need this any more.".

I think this stems from the usage of the subgoal-visualization-wrapper, taking over this task. However, I would suggest to always show the episodic goal and outsource HRL/HAC-specific tweaks to dedicated wrappers.

For our current algorithms, such as SAC etc., no visualization of the end goal is taking place.