Compositionality - an abstraction layer on top of Maestro

[CThuleHansen]

See https://github.com/INTO-CPS-Association/maestro/blob/ctm/139-compositionality/maestro/src/test/java/compositionExampleTest.java as an example of composition that gives this output:

Jacobi
	StepAlgorithm - Fixed - max size 0.5
	FMU-jac1
	Gauss-Seidel
		StepAlgorithm - Variable - max size 0.5
		FMU-gauss1
		FMU-gauss2		
	FMU-jac2
```