superman: more initial improvements

[ds1-e]

• Cleanup some unused stuff
• Fully remove element data (uses custom data system from now on)
  -> With option to restore it by changing SUPERMAN_USE_ELEMENT_DATA to true
• Introduce some security changes:
  -> localPlayer can now only change (force sync to server) it's own data
  -> Ensure valid dataKey and dataValue, by checking whether they match types (string & boolean), and allowed key names

[Fernando-A-Rocha]

Good job! This is much needed.

I've left some comments.

Also, I don't think setPedRotation and getPedRotation should be used (CHandleSuperman.lua) as these functions are deprecated.

[Fernando-A-Rocha]

Mostly good now 👍🏼

[Kinimel]

Mostly good now 👍🏼

I agree, it is really possible to see the development of the system in addition to several observations of error corrections and improvements.

[Nico8340]

Code looks good overall

[Dutchman101]

It's working fine. Also thank you for adding the compatibility layer with element data (opt-in), albeit in a more secure way, so that servers using such checks from other resources can take it easy to migrate to the export/element-data-less way.