78-highlight-changes-in-the-ecmr-history

Acceptance criteria

• Implemented code changes don't diverge from the related issue.
• Documentation reflects the status quo after merge.
• Version number is incremented according to SemVer. (Snapshot versions are not merged/released.)
• Only released versions of dependencies are used (i.e. no snapshot versions).
• Pipeline still works.
• GitLab issue is up-to-date.

If necessary, the following sections have been updated:

• Swagger
• Readme.md
• Documentation

Proposed squash commit message

• Added in ecmr service an observable that will get the next version of the ecmr
• added methode to compare an ecmr currently open version and the next version than it gives back the field keys as a list. based on the given list, the fields would be highlighted.
• Highlighting have a different color for each lighting mode (can be added to environment variables and changed by each company as it pleases once the custom theme is fully implemented)

Closes #78 (closed)