Fixes in unstructured constellation polygon creation

[fpasch]

• Add several parameters to adjust polygon calculation
• Rename parameters: vehicleFrontIntermediateRatioSteps -> vehicleFrontIntermediateYawRateChangeRatioSteps vehicleBackIntermediateRatioSteps -> vehicleBackIntermediateYawRateChangeRatioSteps
• code refactoring (pedestrian and vehicle calculations now use common functions)

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This change is 

[codecov-io]

Codecov Report

Merging #87 into master will increase coverage by 0.13%. The diff coverage is 25.00%.

@@            Coverage Diff             @@
##           master      #87      +/-   ##
==========================================
+ Coverage   61.55%   61.68%   +0.13%     
==========================================
  Files         132      132              
  Lines        4120     4119       -1     
  Branches     1813     1803      -10     
==========================================
+ Hits         2536     2541       +5     
- Misses        582      595      +13     
+ Partials     1002      983      -19     

Impacted Files	Coverage Δ
ad_rss/impl/src/unstructured/Geometry.cpp	44.00% <0.00%> (-9.66%)	:arrow_down:
...rss/impl/src/unstructured/TrajectoryPedestrian.cpp	0.46% <0.00%> (-0.01%)	:arrow_down:
...rss/impl/src/unstructured/TrajectoryPedestrian.hpp	0.00% <ø> (ø)
ad_rss/impl/src/unstructured/TrajectoryVehicle.hpp	100.00% <ø> (ø)
ad_rss/impl/src/unstructured/TrajectoryVehicle.cpp	31.07% <27.09%> (+3.10%)	:arrow_up:
ad_rss/impl/src/unstructured/TrajectoryCommon.cpp	32.03% <30.33%> (-10.82%)	:arrow_down:
ad_rss/impl/src/unstructured/TrajectoryCommon.hpp	61.11% <62.50%> (-1.39%)	:arrow_down:
...ated/include/ad/rss/world/UnstructuredSettings.hpp	95.94% <100.00%> (+2.46%)	:arrow_up:
..._rss/impl/include/ad/rss/unstructured/Geometry.hpp	35.89% <0.00%> (+0.48%)	:arrow_up:
... and 3 more

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