Subpanels, circuits, breakers/slots, smart features, etc on ElectricPanel

[nmerket]

Due to the rushed nature of #420, I left out sub panels and a lot of other important things so we could get out a minimum viable product for the IRA rebates. For the next version of HPXML, we need to circle back and fill out more of those details. See the comments on #420 for a lot of good background on what should be added.

[joseph-robertson]

Related to #396...

We have an in-progress PR on the OpenStudio-HPXML repo for using the ElectricPanel object: NREL/OpenStudio-HPXML#1853

The implementation includes using several extension elements, which facilitate NEC load calculations. A snippet below:

Note:

• Either HeadroomBreakerSpaces or TotalBreakerSpaces would be populated; these are used with the sum of occupied panel load BreakerSpaces to determine panel availability or constraint.
• Possible enumerations for LoadType are hardset to:
  • heating
  • cooling
  • hot water
  • clothes dryer
  • dishwasher
  • range/oven
  • mech vent
  • permanent spa heater
  • permanent spa pump
  • pool heater
  • pool pump
  • well pump
  • electric vehicle charging
  • lighting
  • kitchen
  • laundry
  • other
• All panel loads except for the "other" LoadType require an ID reference