- fixed issue #139 - sometimes the initial ace session was not properly overwritten in the tutor view (feedback editor)

- system settings: MaxCustomProjectsPerUser and MaxCustomTestsPerParticipation 0 should prevent creation, < 0 is unlimited
  - fixed wrong comments
- added fsevents because high cpu usage on macos (webpack known issue)

- fixed issue where aceEditorsStorageHelper create new session was called with a wrong language string thus throwing a not found mode error

- fixes issue #28, we now use my fork of the react-ace editor that allows us to unset the current sessio before the editor gets destroyed

- there is only the marker problem left... the ace marker layer is corrupted see docs/todo

- see docs/todo for issues

  - we next remove MultiTabEditorState

- changed simple ace editor to use onBlur instead of onChange for performance
  - however we now need to keep everything in sync...
- fixed issue with the buttons propagating the langId