FMIL: Merge trunk into 2.0.x branch to release FMIL2.0b1, for #3236.
FMIL: Add causalities `calculatedParameter` and `independent`, and update default initial attribute of variability `input` to `approx`, for #3267.
Update version number in FMIL to 2.0b2, for #3236, as well as date.
Merge FMIL2.0b2 fixes into trunk, for #3236.