Add RISC Heat Sink Override Kit

[pavelbraginskiy]

Depends on MegaMek/megamek#6149

Allows meks to be given a RISC Heat Sink Override Kit. Includes support for record sheets.

Checkbox to add the Kit is hidden when invalid for the current year/tech level.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 2.17%. Comparing base (dca68e8) to head (9df1c7a).
Report is 11 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##             master   #1643      +/-   ##
===========================================
- Coverage      2.17%   2.17%   -0.01%     
  Complexity      209     209              
===========================================
  Files           266     266              
  Lines         30752   30797      +45     
  Branches       5259    5266       +7     
===========================================
  Hits            669     669              
- Misses        29926   29971      +45     
  Partials        157     157              

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