Allow rearranging HVAC equipment in Thermal Zones tab

[macumber]

https://openstudio.uservoice.com/forums/308629-openstudio/suggestions/9099592-allow-rearranging-material-layers-in-construction

Problem: Currently there's not a quick way to rearrange ZoneHVAC equipment in the Thermal Zones tab without a measure. In order to switch the order of equipment the user must delete ZoneHVAC objects losing any user-specified inputs.

Rationale: Heating and cooling priority is set by the order of the ZoneHVAC objects assigned to a zone in the GUI. Not all users are aware of this and it can significantly affect model results.

Solution: Explicitly show the user heating and cooling priority. Add a Grid View feature to increase or decrease selected equipment priority.

Context: ZoneHVAC:EquipmentList

[aaron-boranian]

Migrated from UserVoice

[eringold]

@jmarrec @macumber Do you have an idea of the kind of effort it would take to do this (and #145)? Would it be on the scale of #47?

These two would be massive usability gains in the app.

[jmarrec]

@macumber and I scoped it out quickly and we think there's almost a week of work for this one...