ENH: outletMappedUniformInlet: add multiple fraction, offset and time delays

- Arbitrary number of outlets can be connected to a single inlet
  - Each inlet can be connected to different and arbitrary
    combination of outlets
- Each outlet-inlet connection has:
  - Optional filtration fraction as a Function1 type
  - Optional offset as a Function1 type (i.e. adding/substracting a substance)
  - Optional time delay (from outlet to inlet) as a Function1 type
- Each inlet has an optional base inlet-field as a PatchFunction1 type