Further implementation:
 - Case definition page (Issue #3)
 - Case definition page: instances tab (Issue #8)
 - Case instances page (Issue #11)
 - Case instances page: User Tasks (Issue #12)
 - Case instances page: Executions (Issu #13)
 - Case instances page: Variables (Issue #14)
Merge branch 'master' of https://github.com/holisticon/camunda-acm-plugin