qat.core.gate_set

These classes are core classes hidden behind the AbstractGate class.

`qat.core.gate_set.GateSet`	Collection of `GateSignature`
`qat.core.gate_set.GateSignature`	Describes a gate constructor
`qat.core.gate_set.GateSyntaxRedefinition`	Exception raised when a GateSyntax is redefined in a GateSet