Convert hold point placement to WaypointSolver.

[DanAlbert]

No description provided.

[codecov]

Codecov Report

Merging #3172 (d2402f8) into develop (e43874e) will increase coverage by 0.00%.
The diff coverage is 24.09%.

@@           Coverage Diff            @@
##           develop    #3172   +/-   ##
========================================
  Coverage    45.77%   45.78%           
========================================
  Files          472      473    +1     
  Lines        25741    25780   +39     
  Branches      4508     4510    +2     
========================================
+ Hits         11783    11803   +20     
- Misses       13937    13956   +19     
  Partials        21       21           

Files Changed	Coverage Δ
game/ato/flightplans/antiship.py	0.00% <0.00%> (ø)
game/ato/flightplans/bai.py	0.00% <0.00%> (ø)
game/ato/flightplans/dead.py	0.00% <0.00%> (ø)
game/ato/flightplans/escort.py	0.00% <0.00%> (ø)
game/ato/flightplans/formationattack.py	0.00% <0.00%> (ø)
game/ato/flightplans/ocaaircraft.py	0.00% <0.00%> (ø)
game/ato/flightplans/ocarunway.py	0.00% <0.00%> (ø)
game/ato/flightplans/sead.py	0.00% <0.00%> (ø)
game/ato/flightplans/strike.py	0.00% <0.00%> (ø)
game/ato/flightplans/sweep.py	0.00% <0.00%> (ø)
... and 1 more