Rename VisualScript properties and signals

### Describe the project you are working on

General VisualScript improvements and learning c++

### Describe the problem or limitation you are having in your project

When editing a property name or signal name in the visual script the vs_nodes do not get renamed.
This is the case for functions

### Describe the feature / enhancement and how it helps to overcome the problem or limitation

Implement Similar functionality ass for Function rename.

This will increase refactor capability a lot.

### Describe how your proposal will work, with code, pseudo-code, mock-ups, and/or diagrams

1. Add an edit button like on the right of the function.
@ VisualScriptEditor::_update_members
2. Add edit name to dropdown edit member
@ VisualScriptEditor::_member_rmb_selected
3. when doing any edit in the member's menu assume it needs to be implemented in all the script's nodes that implement that member.
Example code
@ VisualScriptEditor::_rename_function
@ VisualScript::rename_variable

### If this enhancement will not be used often, can it be worked around with a few lines of script?

The lack of this function is mentioned every so often in discord

### Is there a reason why this should be core and not an add-on in the asset library?

This seems base editor functionality