remove unused firing modes from TAG

[NickAragua]

Removes the firing modes that don't do anything from TAG type weapons; additionally, cleans up long-since unused code.

[codecov]

Codecov Report

Base: 23.55% // Head: 23.56% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (a4aa958) compared to base (9991d8c).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #3910   +/-   ##
=========================================
  Coverage     23.55%   23.56%           
  Complexity     4810     4810           
=========================================
  Files          2212     2212           
  Lines        243072   243034   -38     
  Branches      45494    45481   -13     
=========================================
- Hits          57265    57264    -1     
+ Misses       184348   184311   -37     
  Partials       1459     1459           

Impacted Files	Coverage Δ
megamek/src/megamek/common/TagInfo.java	0.00% <0.00%> (ø)
megamek/src/megamek/common/weapons/TAGHandler.java	0.00% <0.00%> (ø)
...amek/src/megamek/common/weapons/WeaponHandler.java	0.00% <0.00%> (ø)
...amek/src/megamek/common/weapons/tag/TAGWeapon.java	80.00% <ø> (-3.34%)	⬇️

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[lgtm-com]

This pull request fixes 1 alert when merging a4aa958 into 9991d8c - view on LGTM.com

fixed alerts:

• 1 for Useless comparison test