Add a simple traffic simulator application

[emmanuel099]

• Each car has a pre-defined start and end position
• The skip time defines the initial delay before the car starts driving
• The safety distances defines the minimum distance between all cars
• The road is divided in segments, each segment can be occupied by at most one driving car
• All cars drive in the same direction
• The simulation ends as soon as all cars reached their end position

Requires the fix from casm-lang/libcasm-fe#190

[codecov]

Codecov Report

Merging #82 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #82   +/-   ##
=======================================
  Coverage   38.33%   38.33%           
=======================================
  Files           6        6           
  Lines         180      180           
=======================================
  Hits           69       69           
  Misses        111      111

Impacted Files	Coverage Δ
etc/src/RunnerBenchmark.cpp	38.46% <0%> (-1.54%)	⬇️
etc/src/RunnerTest.cpp	18.51% <0%> (+1.01%)	⬆️

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[ppaulweber]

Nice example specification!