Merging Class- , Usecase- , Activity- , Object- , Deployment- and Statemachinediagrams into one application

Changes:

Adding new UML diagram types from AME 2021 to the base application (Activity-, Deployment-, Usecase- and Statemachinediagram)
- Inconsistencies among the implementations were removed (mostly within the handlers)
- Unimplemented concepts were added (e.g. child node functionality)
- Model Factories have been split into diagram types
Added the UML Object diagram
Reworked package structure for modelserver commands, which are now structured by diagam type and notation element
GLSP-Modelserver-Integration module was added to reduce complexity, server and client dependencies were update during this process

borkdominik / bigUML