Various Mek crit table improvements

[pavelbraginskiy]

Includes three related features. I implemented the latter two while failing to implement the first one.

1. See [RFE] Auto Sort Updates #1644. RISC Super-Cooled Myomer slots are autosorted after other equipment.
2. Changing the myomer type in the Structure tab now fully removes the previous myomer type right away, instead of leaving parts of it in the unit until something else triggered a full refresh.
3. Critical slots of fixed-location equipment (RISC SCM, Null-Sig, Partial Wing, etc) can now be moved around within a location if you want to reorder them manually:
   

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 2.16%. Comparing base (cb0f45e) to head (48b29e1).
Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##             master   #1646      +/-   ##
===========================================
- Coverage      2.17%   2.16%   -0.01%     
  Complexity      209     209              
===========================================
  Files           266     266              
  Lines         30801   30840      +39     
  Branches       5266    5276      +10     
===========================================
  Hits            669     669              
- Misses        29975   30014      +39     
  Partials        157     157              

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