Implement inputs & outputs group

[barmac]

This requires nested lists concept.

Cf. the prototype.

Inputs

• String or expression
  

• To be discussed: do we want to rebuild the custom auto complete component or wait for a proper code editor component? ==> no, cf. Implement inputs & outputs group #54 (comment)
  

• Script
  

• List
  

• Map
  

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Outputs

• String or expression
  

• Script
  

• List
  

• Map
  

[pinussilvestrus]

In case of camunda:inputOutput, only the first syntax error in an expression is reported by the engine; XML order matter

Source: #2 (comment)

Therefore we might consider disabling sorting here.

[pinussilvestrus]

Inside the old properties panel, we created a first iteration of what we call "auto-suggest text component" - only used by input/output parameter expressions. The question for me would be whether we want to spend time rebuilding this thing. I'd vote for no and tackle it at a later point in time because

• it was really just a first iteration and there is much room for improvement
• it would take us time to build this "hack" again
• it would take us more time right now to build a proper autocomplete (concept + implementation)
• we plan to maybe have a proper code editor/syntax highlighting component anyway in the future (at least we had it once in our OKRs)
• we don't know yet how much this single input was actually used

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I've created an issue to have this once tracked: https://github.com/bpmn-io/bpmn-properties-panel/issues/98