User controls lazy

[MaxiLein]

Summary

• Added 'lazy-loading' to the user-controls
• Added a (further) customizable client component, that can be used, to easily add control-areas to server and clients components
• Callbacks and / or Control-Areas can now be added in arbitrary order
• Callback removal now works via ids, the duplicate check is still done via a map

Details

• closes #258

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[OhKai]

I just noticed on the preview deployment, when I create a process and export it using control+enter in the modeler page, it works fine, but using control+enter in the process list now doesn't seem to work. It shows an error. Using the button to submit does work however.

Note: This only happens if you opened the process modeler before and navigate back to the process list.

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[MaxiLein]

I noticed that some shortcut keys that used to work no longer work. Addressed them in #270.

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