increase the nTrail for the seating test since it is a test that involves probability therefore a larger sample is necessary.

synchronize scenarioStore access. Use exact exponential function for pedestrian and obstacle potential calculation

Remove reflection where reasonable; closes #91 and fixes #86

See merge request !28

Changed parameters for stair test cases (spawn pedestrians only at free spaces and use random positions for spawning).

UltimateBug fix (try) by making sure that only the GUI-Thread changes the ScenarioStore object if the GUI is used and no mix between GUI thread and another thread.

add useful processors for later processorTests to the OSM-Tests. Change old processors in TestSFM to the new format.

update the AttributeAgents values to the values in weidmann-1993 and seitz-2016c for all model test scenarios.

In "TikzGenerator.java", extended class documentation and added quadratic and cubic path generation.

In "TikzGenerator.java", method "convertScenarioElementsToTikz()" respects config if elements are visible.

Also replaced "tikz_icon.png" by "camera_tikz.png".

Note: trajectories are not generated at the moment.

Renamed "TikZGenerator.java" to "TikzGenerator.java" and draw TikZ paths instead of pre-defined shapes for scenario elements.

Watch out: at the moment, the path of the given scenario elements, e.g., agents, is ignored
and a pre-defined shape is used (e.g., for agents a circle).

In "ActionGenerateTikZ.java", added method "generateTikZCode()" with minimal code to generate agents.