allows to select a previous engineer or new crew member to activate large vessels

[Scoppio]

Because we have the concept of "engineer" inside MM to handle the self-healing properties of large vessels, funcitonalities like "mothball" and "activate" are compromised due to them requiring a tech.

This fix does two things:

• fix Can't Activate Dropship #4529, it does that by adding the previous "engineer" to the crew of the mothballed vessel.
• Adds vessel techs to the selection of techs in the "select a techie" drop down window when you want to activate a unit.

The later was necessary to deal with a rare but possible situation. If the engineer that originally mothballed the large vessel (present in the mothballInfo object) is not active, or were removed/sacked by any reason then they would not be available to activate the ship, this means that the ship would be locked in a situation that could only be circunvented by GM activating.

PS.: I hope the second change does not cause any trouble

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 10.49%. Comparing base (519101f) to head (e9da4f6).
Report is 44 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5253      +/-   ##
============================================
- Coverage     10.50%   10.49%   -0.01%     
+ Complexity     6044     6043       -1     
============================================
  Files           957      957              
  Lines        134716   134760      +44     
  Branches      19572    19587      +15     
============================================
- Hits          14149    14145       -4     
- Misses       119216   119266      +50     
+ Partials       1351     1349       -2     

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