Implement first AdoScript to check whether a given model meets certain constraints

This analyzes the current model and stores all the possible paths from an outgoing 'StartEvent'.
Further details are given below:

1. The model to be analyzed has to be of type ControlFlow_20130808. If it is not further execution is being canceled.
2. All existing concepts/classes of type StartEvent are being listed; the number of StartEvents being 1 is a condition for further proceedings.
3. All the possible paths beginning with a StartEvent are stored in an multi-dimensional array.
4. Echos whether a certain path ends in an Event called StopEvent or not.
Merge branch 'feature-150' into develop

First implementation of an algorithm for checking constraints.