Add line swap shortcuts like vscode

[ShortArrow]

Justification

This feature is one of the reasons why I want to reject VBA and adopt a language that can be used with vscode.

Description

Add swap lines feature like vscode of Move line up and down

[Vogel612]

Because any feature like this will necessarily interact with the the selection inside the vbe, this is somewhat complex to implement. Moving all selected lines around is surprisingly complex, especially since we can't rely on the parser state to accomplish this (if we want this to be useful at all we can't reparse between every move)