[TASK] Integrate template controller

Example URI: /template/Meeting/Index.html
[TASK] Make use of template controller in AngularJS routing
Revert "[TASK] Integrated scheduleStartTime in Meeting and TestData"

This reverts commit f55825ddeaa54d50b3a23e86c3eae927bd958fed.
The referenced change introduced a severe misbehavior.
[TASK] Integrated scheduleStartTime in Meeting and TestData
[TASK] Add ModificationInterface and trigger implicit invokation in HistoryService
[BUGFIX] Missing type hints in method signature