Add a radio log to missions

[sparlane]

Is your feature request related to a problem? Please describe.
Add the ability to log radio communications as part of the mission

Describe the solution you'd like
Add an extra part to the mission to log/see all radio communications
For each entry:

• date/time
• user who recorded the log
• To (asset, user or free-form name)
• From (asset, user or free-form name)
• Channel
• Message
• Priority/Critical flag or type, to make it easier to identify important vs routine logs

Describe alternatives you've considered
This information could be recorded in the mission timeline, but it would need a new category (the radio message should go into the log anyways)

Additional context
In the future the inclusion of audio recording and/or post-updated transcription should be possible
Also, it might help to be able to link to an external source(s) (i.e. an auto-recorder or RDF result)