Use override keyword when possible

[feliwir]

• Remove virtual keyword when not required
• Use override keyword when a function overrides

[codecov-commenter]

Codecov Report

Patch coverage: 3.60% and no project coverage change.

Comparison is base (e1609b2) 2.67% compared to head (b6e4655) 2.67%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           develop    #972   +/-   ##
=======================================
  Coverage     2.67%   2.67%           
=======================================
  Files          822     822           
  Lines        89290   89290           
  Branches     14799   14799           
=======================================
  Hits          2387    2387           
  Misses       86559   86559           
  Partials       344     344           

Files Changed	Coverage Δ
src/game/client/anim2d.h	0.00% <0.00%> (ø)
src/game/client/baseheightmap.h	0.00% <0.00%> (ø)
src/game/client/camerashakesystem.h	0.00% <0.00%> (ø)
src/game/client/crashpreferences.h	0.00% <0.00%> (ø)
src/game/client/display.h	0.00% <0.00%> (ø)
src/game/client/displaystring.h	0.00% <ø> (ø)
src/game/client/draw/drawable.h	0.00% <0.00%> (ø)
src/game/client/draw/tintenvelope.h	0.00% <0.00%> (ø)
src/game/client/draw/w3ddebrisdraw.h	0.00% <0.00%> (ø)
src/game/client/draw/w3ddefaultdraw.h	0.00% <0.00%> (ø)
... and 254 more

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[xezon]

I do not like this. I personally would like it to keep virtual always.

[xezon]

But adding override everywhere necessary is good.

[feliwir]

I closed the PRs for now since they‘re pretty outdated. My focus for now is to get standalone working (to some degree).
I’ll pick those up again later