Add process id of participant to properties panel

[azeghers]

Closes #278

Adds the inputs to edit a participant's process name and id to the properties panel.

Acceptance Criteria

• [ ] Corresponds to the concept
• [ ] Corresponds to the design

Definition of Done

• [ ] corresponds to the design principles
• [ ] corresponds to the code standards
• [ ] passes Continuous Integration checks
• [ ] available as feature branch on GitHub
  • [ ] contains the cleaned up commit history
  • [ ] commit messages satisfy our commit message guidelines
  • [ ] a single commit closes the issue via Closes #issuenr

[MaxTru]

Added @andreasgeier for review via modeling-design

[andreasgeier]

In the current state, I can see and edit new fields for the Process ID and Process Name. So basically, the issue is fixed.

From the UX perspective, it would be an improvement when we are always specific with the process and participant labels like Ingo described here. I understand that this is a generic component and the generic labels are used for all elements but these two are main elements. Moreover: for the process we do not even have a selection marker. And having attributes of two elements in a property panel is also questionable. All of this speaks in favor of specific labels for both.

[nikku]

All of this speaks in favor of specific labels for both.

You think of Process Id / Process Name and Participant Id / Participant Name here or what would be your suggestion?

[andreasgeier]

Exactly

[nikku]

I agree that this would improve things and it is an easy pick, too.

@azeghers Would you be O.K. with shipping that additional improvement as a follow up to this PR? We'd need to improve it in both apps, of course.