Change appendChild / prependChild to createActions

[pascalwilbrink]

In order to make maximum use of the Action API, we should change all the appendChild and prependChild occurrences to createActions. This is used in OpenSCD and CoMPAS.

This will make sure that the new element will be in the right place. If a new XSD schema rolls out, we only have to change 1 function, the foundation.

[pascalwilbrink]

usages:

connectedAp.ts subnetwork.ts editors/subscription/foundation.ts menu/virtualtemplateied/foundation.ts wizards/address.ts wizards/bda.ts wizards/clientln.ts wizards/conductingequipment.ts wizards/da.ts wizards/reportcontrol.ts wizards/sampledvaluedcontrolts wizards/voltagelevel.ts wizards/subNetwork.ts

[Sander3003]

@JakobVogelsang will look into the current usage and determine if change is needed.

[Sander3003]

It is a bug when undo will result in a missing element.

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[Sander3003]

Fixed by the new action API