Use AdditionalProperties instead of object name comparisons

[shorowit]

OS-HPXML originally had to rely on object names (e.g., Constants.ObjectNameFoo) in many situations to understand what building component a, e.g., ElectricEquipment or InfiltrationDesignFlowRate object represents. But this comes with some risk because object names may end up with various string prefixes/suffixes (e.g., if there are multiple objects of the same type), or get converted to snake_case, etc.

Now that the OpenStudio AdditionalProperties object exists, we should audit our code and start using it. It will eliminate this risk once and for all.