Fix 5825: ASF Low Altitude LOS, levels, and ground map terrain blocking other terrain

[Sleet01]

Reverted some low-altitude map changes, extracted relevant code to Low Alt-specific functions, and updated some LOS measuring and drawing functions to work with Altitudes. Marking as Draft for now so more testing can get run.

Current visuals look like:

With Diagramming LOS:

Testing so far:

• Ran human-vs-bot ASF games on Low Altitude maps
• Ran all 3 projects' unit tests

Close #5825

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 29.00%. Comparing base (ac6e56a) to head (7586dde).
Report is 68 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5838      +/-   ##
============================================
- Coverage     29.07%   29.00%   -0.08%     
+ Complexity    13937    13927      -10     
============================================
  Files          2507     2511       +4     
  Lines        266470   267223     +753     
  Branches      47652    47822     +170     
============================================
+ Hits          77477    77507      +30     
- Misses       185042   185768     +726     
+ Partials       3951     3948       -3     

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[SJuliez]

Ready for review? You wrote that this was marked as draft but it isnt.

[Sleet01]

Ready for review? You wrote that this was marked as draft but it isnt.

Sorry, that's the 2AM brain talking. I'll mark it as draft and get some more testing in.

[pokefan548]

Did some testing clients-akimbo on a snapshot provided by Sleet. Rigorous testing of vanilla LOS, and some brief testing of Diagramming and Dead Zone LOS rules. All results point to everything working as intended.

[Sleet01]

I also got some more testing in, although some just proved that the previous code was busted. Ready to pull.