Fix 3775: unable to assign nonsuperheavy crew

[Sleet01]

Includes a couple of fixes for non-standard Mek crew complements:

1. Non-SH Tripods can now be assigned to crews, or have crews assigned to them.
2. Pilots can be assigned to SH and Tripods in the Personnel tab (previously broken)

Testing:

• Ran all unit tests across 3 projects (several still failing in MekHQ, unrelated)
• Tested crew assignments in a campaign with both SuperHeavy and Medium Tripod meks.

Close #3775

[SJuliez]

Are the failed tests important?

[Sleet01]

Are the failed tests important?

Negative; these are the refit tests that I fixed later:

RefitTest > fleaFLE4toFLE15Test() FAILED
    org.opentest4j.AssertionFailedError: expected: <1> but was: <0>
...
RefitTest > locust1Vto1ETest() FAILED
    org.opentest4j.AssertionFailedError: expected: <1> but was: <0>
...
RefitTest > heavyTrackedApcMgToStandard() FAILED
    org.opentest4j.AssertionFailedError: expected: <1> but was: <0>