documents/CHANGELOG: Remove ECL/CCL/EQL and external editor tasks.
documents/CHANGELOG: Remove ECL/CCL/EQL and external editor tasks.

- CCL works on master.
- ECL 20.4.24 breaks Parenscript, so we need to wait for a new release.
- We are probably not going to support EQL if there is no demand.
- External editor is supported, although some features are still to be
  implemented.

jmercouris/NeXT,jmercouris/NeXT