Add sink module

Split !1066 (closed)

Here I am simply adding the modules for the sink particles but do not use them.

mentioned in merge request !1069 (merged)

added 1 commit

• d4c7ca5c - Applied code formatting tool

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That's all fine by me. So far it's un-testable but does not break anyone else's code or runs.

Perfect, as soon as you merge it, I will do a few test on the other branch.

merged

mentioned in commit a85a07cf