Start at generalizing OSComboBox2. Wow--concepts are awesome--thanks @lefticus!
Refactored OSComboBox2 builds. Currently debugging. Intended surface type box on constructions not yet working properly.
Generalization of OSComboBox2 works for non-grid view fields.
Merge branch 'GridView' into GeneralizedComboBox

Conflicts:
	openstudiocore/src/shared_gui_components/OSConcepts.hpp
	openstudiocore/src/shared_gui_components/OSGridController.hpp
Merge pull request #880 from NREL/GeneralizedComboBox

Generalized combo box