Issue205 valve

This merges the new valve that uses a table for the flow function. The new valve is also needed for the Annex 60 benchmarks.


It also merges the reorganization of the Examples package for Fluid.Actuators. The examples are now separated for the valves and the air dampers.

Also, the keyword `input` has been added to the flow function `phi` in the base class of the valves. This was done to use the same design pattern as is used in `Fluid.Interfaces` for the energy and mass balances.