Remove old ASIST mnemonics from doxygen comments

[skliper]

Is your feature request related to a problem? Please describe.
There's alias, extra mnemonic mapping files, and extra comments in code that lead to extra documentation that doesn't apply to anything other than internal proprietary ground stations.

They also are very fragile... defining the mnemonic in the middle of a comment block caused warnings like cfecmdmnems:11: warning: Illegal command \dd as the argument of a \dd command but when defined at the top and immediately followed by another alias there were no warnings.

Describe the solution you'd like
Remove

Describe alternatives you've considered
None

Additional context
None

Requester Info
Jacob Hageman - NASA/GSFC

[astrogeco]

CCB 20200318 - Approved