Remove IED button

[Sander3003]

As an OpenSCD engineer user
I want to a button to remove IED's from a SCL file
So I can remove IED's that are not needed any longer

Accpetance criteria:
The IED and related information should be removed
Including the related reporting blocks

Background:
When editing a substation, it could be usefull to remove a IED of an exsiting configuration.

[randy993]

Add trashbin icon to:

And add Remove button to:

Upon deletion, delete the <IED> element and the references to the IED element.

• All <ConnectedAP> elements in other IEDs with iedName = {the deleted IED}
• All <ExtRef> elements in other IEDs with iedName = {the deleted IED}
• All <SampledValueControl> elements with a value of the deleted IED name in the element <IEDName>
• All <GSEControl> elements with a value of the deleted ied name in the elemnt <IEDName>

What about <tControlWithIEDName>?

Maybe we should warn the user that all references to the IED will be deleted as well? For example GOOSE/SMV subscriptions etc?

[Sander3003]

To be added:
Dialog with things that are being removed (elements)

The delete function can be added to the *** menu

The rename function can be used to check if the remove function is complete: #453

[Sander3003]

The following reference to the IED Name are removed.
The attribute (between []) of the following elements:

• Association[iedName]
• ClientLN[iedName]
• ConnectedAP[iedName]
• ExtRef[iedName]
• KDC[iedName]
• LNode[iedName]

The Text Content of the following elements:

• GSEControl > IEDName
• SampledValueControl > IEDName

TODO:
Don't forget to remove the data template section ( @JakobVogelsang will make a suggestion for this).