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See merge request !48

cherry picked all changes from the cleanup-widgets branch and merged them to the new file/ folder structure and package versions; most likely, further fixes are required to make things work. Improves #209 and #205

WIP, Add some TODOs in new scenario container, backend responses of scenarios endpoint require adaptions for frontend compatibility

# Conflicts:
#	src/app.js

- Grouping js files based on the elements of the data model instead of parent js class
- All js files providing functionality for one element of the data model are now in one folder; this makes is easier to implement changes for one element in all affected files/ classes
- js files which are common to multiple elements are in the common folder
- The new structure is more in alignment with the new Go backend code base structure
- This commit does not contain any changes in functionality of the frontend

- make edit user dialog work with new backend
- form validation moved to handle changes method
- Admins can change any user's password

- some modifications required due to React update
- merge form validation with handling changes
- role of new user defaults to User instead of Admin

- fix issue with event handler for deletion of simulator