Updating Terminal Attributes after updating name of VoltageLevel or Bay

[dlabordus]

Describe the bug
When updating the name of a Bay or VoltageLevel these names are also registered as BayName/VoltageLevelName by Terminals.
These attributes of the Terminal aren't updated.
In PR #671 this is solved for the name of the Substation, the strange thing is that this cause problems when validating the XML, for Bay and VoltageLevel this isn't cause any validation problems.

To Reproduce
Steps to reproduce the behavior:

1. Open a SCD with Substation, VoltageLevel, Bay and Terminal(s), where there is a reference in Terminal to the different levels.
2. Update the name of the VoltageLevel and Bay.
3. Save the file and check if the attributes in the terminal are updated.

Expected behavior
The attributes in the Terminal should be updated

Additional context
Example part where the attributes aren't updated:

<Substation name="AA1-UPD" desc="Substation" sxy:x="1" sxy:y="3">
	<VoltageLevel sxy:x="1" sxy:y="3" name="J1-UPD" desc="Voltage Level">
		<Voltage unit="V" multiplier="k">20</Voltage>
		<Bay sxy:x="1" sxy:y="6" name="Bay A-UPD" desc="Feld A">
			<ConductingEquipment type="DIS" sxy:x="1" sxy:y="1" name="QB1">
				<Terminal name="T3" connectivityNode="AA1/J1/Bay A/L1" substationName="AA1" voltageLevelName="J1" bayName="Bay A" cNodeName="L1" txy:actTerm="2"/>
			</ConductingEquipment>