Proposal to add Pset_LightFixtureTypeCommon.ControlGear

Lighting engineers need to nominate the way light fixtures are controlled.

Based on some work with a lighting engineer on luminaire schedules I'd propose a new property "ControlGear" with an IfcLabel data type.

An example would be: https://en.wikipedia.org/wiki/Digital_Addressable_Lighting_Interface so it may have a value of "DALI".

Ping @CyrilWaechter @kennethsolvik @trond-graphisoft - I am told it is something quite fundamental to all light fixtures but would be good to get more eyes.