Get dropzone for Definitions hooked up

[#74774412]
Schedules are now hooked up as dropzones

 - but it doesn't work because OSDropZone3 seems to not know how to populate
   itself from the getter method

[#74774412]
Merge branch '74774412_-ThermalZoneGridView' of https://github.com/NREL/OpenStudio into 74774412_-ThermalZoneGridView

Conflicts:
	openstudiocore/src/openstudio_lib/SpaceTypesGridView.cpp