---------------------------
- Sets time to and date of HIV death for those not on ART and who fail on ART
- Moves all HIV attributes, parameters, and results into hivsim class instance
- Merges HIV results with sim.results at conclusion of simulation
- Adds HIV pars as an argument to calibration as well as HIV-specific results to age-results analyzer
- Allows for flexible severity growth functions
- *Github info* PR `542 <https://github.com/amath-idm/hpvsim/pull/542>`__