Fix diagonal movement speed bug

[xezon]

This change fixes the diagonal movement speed bug.

Reference https://github.com/TheSuperHackers/GeneralsGameCode/issues/123

Demo

https://user-images.githubusercontent.com/4720891/193651852-ba618719-c85c-4b9b-8ad4-7058da911af4.mp4

[xezon]

I suggest to merge this fix later when we no longer need game state to be consistent with original. For now it will be good to have Thyme work similar to Original, so we can use Original Replays to backtest and find issues. This change would break this ability.

[xezon]

Fix is done, but converting to Draft for the time being.

[xezon]

Functions were moved from header to cpp file. Change updated accordingly.

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (e1609b2) 2.67% compared to head (4b6826b) 2.67%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           develop    TheSuperHackers/GeneralsGamePatch#752   +/-   ##
=======================================
  Coverage     2.67%   2.67%           
=======================================
  Files          822     822           
  Lines        89290   89294    +4     
  Branches     14799   14799           
=======================================
+ Hits          2387    2390    +3     
- Misses       86559   86560    +1     
  Partials       344     344           

Files Changed	Coverage Δ
src/game/logic/object/update/physicsupdate.cpp	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes

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