Allow component property to be associated with a connection type

DI requires that schema properties be associated with a type of connection (this is expressed in ElementParameter.setContext()). Right now this is calculated (incorrectly) in the studio code. We need to have a means of associating a Connector type with a (schema) property.

This could possibly be done by the generic key/value mechanism as long as it is associated with a property. We should see if this would be used in the GDF/Beam stuff.