What this MR does / why does DuMux need it:
This merge request should remove duplicated code often seen in the volvars' update functions. This issue is outlined in #814.
**Question: ** does it make sense to add new headers to the dumux/material/constraintsolvers/ directory, or would another location make more sense?
Before you request a review from someone, make sure to revise the following points:
does the new code follow the style guide?
do the test pipelines pass? (see guide on how to run pipelines for a merge request)
is the code you changed and/or the new code you wrote covered in the test suite? (if not, extend the existing tests or write new ones)
does your change affect public interfaces or behavior, or, does it introduce a new feature? If so, document the change in
is the list of the header includes complete? ("include what you use")
all files have to end with a
\ncharacter. Make sure there is no
\ No newline at end of filecomment in "Changes" of this MR.