`Feature`: Event and Task Type Selection

[matthiaslehnertum]

This PR extends Apollon by the ability to select event types more specific than just start, intermediate and end events.

Start Event

Update dialog of the Start Event

All available Start Event types

Intermediate Event

Update dialog of the Intermediate Event

All available Intermediate Event types

End Event Update dialog of the End Event

All available End Event types

Checklist

• [ ] I documented the TypeScript code using JSDoc style.
• [ ] I added multiple screenshots/screencasts of my UI changes
• [ ] I translated all the newly inserted strings into German and English

Motivation and Context

To fully comply with the BPMN 2.0 standard, events and tasks need to allow for specifying specialisations.

Steps for Testing

For Events Drag any event onto the canvas, double click it and select an event type.

For Tasks Drag any task onto the canvas, double click and select a task type.

[loreanvictor]

ok the functionality seems to work as intended, saving / loading state works, exporting works fine for the new elements and tests are passing. I would have a few small suggestions (some of these can also be added on a follow up PR I suppose):

• add test coverage report to the PR
• (might be a follow-up PR) increase test coverage
• (might be a follow-up PR) the placing of the contextual menu can sometimes be problematic for the new elements, it hides the element which means you can't see the effect of your actions immediately (you need to close the menu to see if you picked the correct type):

[matthiaslehnertum]

@loreanvictor I increased the test coverage, thank you for the remark! The incorrect positioning of the update dialog seems to be a general issue not directly related to this PR. I will try to fix that one in another PR! :)