Stunner - Distinguish sub-process vars from process vars in Documentation

Currently all process variables are under one category Variables. The purpose of this enhancement is to distinguish sub-process variables from process variables in generated Documentation.

Possible solutions:

• Separate sub-process variables to its own category
  • There could be shown also a name or ID of concrete sub-process
• Display column describing the scope of variable in Variables table
  • If the scope is sub-process, there could be shown also a name or ID of concrete sub-process