Host absent

[HenrietteCapel]

Is your feature request related to a problem? Please describe.
A person should be able to be absent. For example when it's child is in isolation or quarantine.

Describe the solution you'd like
Make absent a property of a Person. Note that the adult staying home (random household person >18) should be alive and that there isn't already a parent staying home (quarantine, isolation, not-working).

Describe alternatives you've considered
A clear and concise description of any alternative solutions or implementations you've considered.

Comparison to CovidSim
CovidSim has:
AC - Non-quarantined working adult cases absent thru sickness.
AA - Absent working adults who are caring for sick children (only assigned if no non-working, quarantine or sick adults available).
ACS - Children below care requirement cut-off age who are absent (sick or quarantined)

APC - Non-quarantined working adult cases absent due to closure of their workplace (excl teachers).
APA - Absent working adults who are caring for children at home due to school closure (only assigned if no non-working, quarantine or sick adults available).
ACS - Children below care requirement cut-off age who are absent due to school closure

Additional context
Add any other context or screenshots about the feature request here.