Improve player vehicle enter behaviour

[seeseemelk]

Like the exit vehicle pull request, this one improves entering a vehicle

[codecov[bot]]

Codecov Report

Merging #725 into master will decrease coverage by 0.01%. The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #725      +/-   ##
==========================================
- Coverage   18.12%   18.11%   -0.02%     
==========================================
  Files         252      252              
  Lines       22938    22958      +20     
  Branches     5769     5776       +7     
==========================================
  Hits         4158     4158              
- Misses      17659    17677      +18     
- Partials     1121     1123       +2

Impacted Files	Coverage Δ
rwengine/src/script/ScriptMachine.cpp	0% <ø> (ø)	:arrow_up:
rwengine/src/objects/VehicleObject.hpp	0% <ø> (ø)	:arrow_up:
rwengine/src/objects/CharacterObject.cpp	13.25% <0%> (ø)	:arrow_up:
rwengine/src/objects/VehicleObject.cpp	11.34% <0%> (-0.14%)	:arrow_down:
rwengine/src/ai/CharacterController.cpp	7.55% <0%> (-0.19%)	:arrow_down:

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