Embedded Assumptions about Equipment Availability

[tbhallett]

In the original writing of the disease modules, we embedded some assumptions about equipment being available. Now that we have an explicit accounting of equipment being available, we should refactor this.

          Hi @joehcollins @EvaJanouskova, naive question about how this PR deals with module parameters which already embed assumptions about equipment availability. To give a concrete example: the probability that a woman receives blood pressure measurement during an ANC appt is based on observed data, and hence already includes assumptions about equipment availability. If we wanted to self-consistently capture the effect of equipment availability, this probability should  therefore increase (and if so, by how much?) if equipment is established as being present for the appt. Is this (or a similar logic) already included in the PR?

Originally posted by @marghe-molaro in #1124 (comment)