Proof of Concept: handle "ElapsedTime" and "Wait" event in "UpdateSchemeEventDriven.java" and "UpdateSchemeSequential.java".

VadereSimulator/src/org/vadere/simulator/models/Model.java:
- Removed method "update(final List<Event> events)".

VadereSimulator/src/org/vadere/simulator/models/osm/OptimalStepsModel.java:
- Removed unnecessary methods (used for original proof of concept).

This new class interacts with class "Pedestrian". Therefore, added variable "mostImportantEvent" to "Pedestrian" and reformatted this class.

Updated also two scenario files.

Merged branch 'master' into add_event_handling, but removed event handling in "OptimalStepsModel.java" to avoid merge conflicts.

# Conflicts:
#	.gitlab-ci.yml
#	VadereModelTests/TestOSM/scenarios/rimea_14_select_route_pso.scenario
#	VadereSimulator/src/org/vadere/simulator/control/Simulation.java
#	VadereSimulator/src/org/vadere/simulator/models/osm/OptimalStepsModel.java

improve garbage collection for the meshes, fix bug in walk and jump algorithm, prepare for mesh drawing into a panel for the gui.

Fix #160: In "TikzGenerator.java", use "String.format(Locale.US, ..." to force a dot as decimal separator.

fix wrong minX minY for CellGrid, false in cone walk in ITriConnectivity and use of the wrong EikonalSolver if the type is NONE.

useRandomSpawn=false.

refactoring of the module / package structure: potentialfield calculators are now in the module simulation and the module meshing requires the module utils which is again the module without dependencies. simulation depends on meshing