Fixed track circuit based simulations

[npiganeau]

Fixed signal updates from next signal

[npiganeau]

Needs fix when new route is set just behind a train, entering signal does not update when train leaves the block.

[codecov]

Codecov Report

Merging #20 into master will increase coverage by 3.44%.
The diff coverage is 89.65%.

@@            Coverage Diff             @@
##           master      #20      +/-   ##
==========================================
+ Coverage   72.51%   75.95%   +3.44%     
==========================================
  Files          37       37              
  Lines        2405     2425      +20     
==========================================
+ Hits         1744     1842      +98     
+ Misses        545      472      -73     
+ Partials      116      111       -5

Impacted Files	Coverage Δ
simulation/signal_conditions.go	80.18% <100%> (+6.3%)	⬆️
simulation/trains.go	46.38% <100%> (+3.76%)	⬆️
simulation/simulation.go	87.24% <100%> (+0.26%)	⬆️
simulation/track_signals.go	80.88% <82.35%> (+9.12%)	⬆️
simulation/position.go	61.79% <0%> (+2.24%)	⬆️
simulation/track_points.go	85.07% <0%> (+5.97%)	⬆️
simulation/track_items.go	82.51% <0%> (+6.55%)	⬆️
... and 1 more

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