[*52820329] Make OpenStudio App Utility Bill sub tab: initial commit.
Initial addition of UtilityBill object

[#53234791]
[#53022305] Make OpenStudio App Utility Bill sub tab: added inspector
Merge branch 'ticket53022305-model-calibration' of https://github.com/NREL/OpenStudio into ticket53022305-model-calibration
Adding stubbed in UtilityBill object for Evan to start wiring, does not work yet

[#53234791]
Working on UtilityBill object, have unit conversion factors in

[#53234791]
Adding billingPeriods()

[#53234791]
[#52820329] Make OpenStudio App Utility Bill sub tab: add required virtual methods, and cleanup.
Passing initial unit tests, need lots more

[#53022305]
Fixes #389 model.roofs broken
[#52820329] Make OpenStudio App Utility Bill sub tab: wire subTabView
Merge branch 'ticket53022305-model-calibration' of https://github.com/NREL/OpenStudio into ticket53022305-model-calibration
[#53022701] Make OpenStudio App calibration results view: Make comparison classes
The UtilityBill object should be ready for wiring.  There are unit test failures that I believe will be fixed when changes made for sdd work related to WaterSystems are merged to this branch.

[#53022305]
Merge branch 'ticket53022305-model-calibration' of github.com:NREL/OpenStudio into ticket53022305-model-calibration
Have one utility bill regression test passing but not working for wrap around years.

[#53022305]
Adding final method to get number of billing periods used in calculations

[#53022305]
[#52820329] Make OpenStudio App Utility Bill sub tab: fix compile error
Merge branch 'ticket53022305-model-calibration' of https://github.com/NREL/OpenStudio into ticket53022305-model-calibration
merging develop into branch.