Stabilisation in Initialization plugin

[CThuleHansen]

Implement stabilisation in the initialization plugin and document its conceptual behaviour.

A runtime module has been created to support the isClose behaviour: https://github.com/INTO-CPS-Association/maestro/commit/4f717488ffb21a421ba6af0b781d3d5fc9934c84

In order to use this behaviour one has to load Math: Math math = load("Math") Afterwards, one can use math.isClose(real a, real b, real absolutetolerance, real relativetolerance), which returns a boolean.