Issue 2090: /nova chat command now works with non-enemy mechs too, as long as you own at least one

[psikomonkie]

Fixes #2090

Notable "change":

• OLD: /nova link required the entities you're linking to all be owned by you
• NEW: /nova link requires the entities you're linking to not be enemies AND one must be owned by you.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 28.95%. Comparing base (3b7ac02) to head (3fb19d9).
Report is 20 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6310      +/-   ##
============================================
- Coverage     28.95%   28.95%   -0.01%     
+ Complexity    14032    14031       -1     
============================================
  Files          2672     2672              
  Lines        269292   269322      +30     
  Branches      47929    47948      +19     
============================================
- Hits          77970    77969       -1     
- Misses       187418   187452      +34     
+ Partials       3904     3901       -3     

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