- fixed faulty generator log output: certain graphs caused the 'creating edge x of y'-messages to contain wrong x/y values
- fixed a test case

This includes:
- removal of optionals as fields
- removal of unnecessary 'public abstract' modifiers in interfaces
- more lambdas and method reference usage
- simplified dataflow
- removal of faulty integer divisions
- renaming of expected exceptions in JUnit tests
- typo fixes

Also inserted corresponding calls where possible.

Closes #2.

Also moved some code around, renamed some things here and there, fixed some tests, ... Many little changes. You know how it is.

Also renamed some classes again.

The culprit was the way the remaining delay had been distributed over the edges connecting them with each other.