With the upcomming PR are nearly all features of the ATC COMM-functions implemented.
The documentation needs to be extended about the semantic response (more than ROGER, etc), the high priority messages, the monitored messages with reminders in the DCDU, the auto-closing of messages in the DCDU, the recall function and the modification of semantic responses.

Most of the images need to be updated due to a complete MCDU refactoring to the 2021 FCOM

Only missing Hoppie feature afterwards:
FPL changes for Lat requests

This PR implements all the features:
flybywiresim/aircraft#7074