[Feature] Add a prompt to choose which script to modify

[Rybadour]

When there are more than 1 script attached to nodes in the current scene prompt the user with a list of all the scripts to select.

Stretch goal 1: Sort the list based on which scripts are a common ancestor to all the selected nodes. With ancestors that are higher in the hierarchy being lower in the list.

Stretch goal 2: Show two lists of scripts. The first list is ancestors common to all selected nodes and the second list is scripts that aren't. Or at least de-emphasize the scripts that don't share a common ancestor.

[nonunknown]

After the next update, I'll try to implement support for nodepath