ENH: Add a WYSIWYG editor for text properties

Summary

Needed for https://gitlab.indiscale.com/caosdb/customers/cfaed/management/-/issues/13. Adds a WYSIWYG editor to (scalar) text properties that produces markdown output.

Focus

ckeditor was added to the project's dependencies and is used in ext_editmode_wysiwyg_text.js to replace the textareas of scalar text properties. Do you think that the decision to leave out lists of text is a reasonable one?

Test Environment

Start the WebUI wit BUILD_MODULE_EXT_EDITMODE_WYSIWYG_TEXT = ENABLED. Verify that

• entities with text properties are assigned WYSIWYG editors when they are edited
• the editor does not appear in any other input fields
• newly added text properties also have the editor
• toggling a scalar property to a list makes the editor vanish, toggling back makes it re-appear

You may also test the output of the editor with various markdown commands together with the complexity wiki. Use the local-query branch of the cfaed server profile and main in complexitywiki for this.

Check List for the Author

Please, prepare your MR for a review. Be sure to write a summary and a focus and create gitlab comments for the reviewer. They should guide the reviewer through the changes, explain your changes and also point out open questions. For further good practices have a look at our review guidelines

• All automated tests pass
• Reference related Issues
• Up-to-date CHANGELOG.md
• Annotations in code (Gitlab comments)
  • Intent of new code
  • Problems with old code
  • Why this implementation?

Check List for the Reviewer

• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md
• The test environment setup works and the intended behavior is reproducible in the test environment
• In-code documentation and comments are up-to-date.
• Check: Are there spezifications? Are they satisfied?

For further good practices have a look at our review guidelines.

CHANGELOG.md

@@ -18,6 +18,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   See `build.properties.d/00_default.properties` for more information
 * Start editing an entity/creating a new record directly by adding an `#edit` or
   `#new_record` URI fragment, respectively.
+* Optional WYSIWYG editor with markdown output for text properties. Controled by
+  the `BUILD_MODULE_EXT_EDITMODE_WYSIWYG_TEXT` build variable which is set do
+  `DISABLED` by default.
 
 ### Changed (for changes in existing functionality)