Feat/refactor flags

[Scoppio]

What this PR does?

Changes every single BigInteger in MegaMek for an Enum, uses a specialized BitSet to substitute the BigInteger and emulates its API to make it possible to substitute with minimal changes in code all around the application.

This change reduces the amount of time it takes to go through the function EquipmentType::hasFlag which today is quite slow and is queried extremelly frequently.

How to use this PR?

This PR is standalone but probably MML and MHQ need to be updated, this is literally to get an "ok" on the change.

Improvements

I have tested using EnumSet for the flags, and a mix of Enum + BitSet, where the enum is a flag position in the bitSet and the bitset holds the flags itself. This was the result when running a Megamek game with 5 Princesses, no human players, for around 3 minutes. The same scenario was run the 3 times.

Flag Type	Time Run	Total Time	Percent	Normalized improvement
BigInteger	31,346ms	210,000ms	14.92%	-
EnumSet	2,213ms	180,000ms	1.23%	12x
Enum+BitSet	72ms	180,000ms	0.04%	361x

The BitInteger, the original implementation, spent 31 seconds of the total 210 seconds of the test duration. With EnumSet the time spent querying hasFlag reduced to 2 secons, and with the Enum + BitSet the time was further reduced to 72ms.
With a few extra repetitions the result varied around 300ms and 50ms, depending on how many units were alive after the first couple of minutes.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 28.65%. Comparing base (313ad5c) to head (77450ac).
Report is 9 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6475      +/-   ##
============================================
+ Coverage     28.56%   28.65%   +0.09%     
- Complexity    14373    14392      +19     
============================================
  Files          2798     2803       +5     
  Lines        275101   275456     +355     
  Branches      48669    48669              
============================================
+ Hits          78576    78940     +364     
+ Misses       191890   191881       -9     
  Partials       4635     4635              

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[Scoppio]

AmmoTypeFlag and WeaponTypeFlags reordered by family of weapon and alphabetized in each family.
Using ordinal instead of the original number values as the values are not persisted anywhere (will do a few more validations before we merge this one, and also may need changes for MML and MHQ, so this is not to be merged until both have their own branches.

[rjhancock]

Request: Add comments for each section of values for new people to know what kind of enums go into each section.

[Scoppio]

I was expecting for this comment XD

I'm not finished with it yet, too many equipment to figure out what each one of them is or means, so I am going slowly.

[rjhancock]

Just the one requested change about the comments for the enum groupings.

[rjhancock]

Once done with the comments for the types within the enums, this should be good to go.