[ENH] Allow specification of union types in input/output meta defintions #11
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Allow the specification of union types by generalizing the the single type spec in the Input/OutputSignal to a tuple of types.
Ref: biolab/orange3#3545 (comment)
A strict connection type checks if all the source types are subtypes of the sink types.
A dynamic connection type checks if at least one of the sink types is a subtype of one of the source types.