System name for signal group in arxml

[pempem98]

canmatrix/src/canmatrix/canmatrix.py

Lines 480 to 487 in 515eb89

	class SignalGroup(object):
	"""
	Represents signal-group, containing multiple Signals.
	"""
	name = attr.ib() # type: str
	id = attr.ib() # type: int
	signals = attr.ib(factory=list, repr=False) # type: typing.MutableSequence[Signal]
	e2e_trans = attr.ib(default=None)

Hi @ebroecker,
Can we have the system name for signal group in arxml file?
Same as system signal and normal signal, system signal group has the tag and can be get by reference tag from signal group