Proper Flipping for ArmorStands

### The Problem

With the current versions of WorldEdit, if you want to flip a selection that contains armorstands, it merely rotates these by 180 degrees. While they face the right direction after that, it isn't a real flip, just a rotation.

### A Solution

It would be great if the armorstand could be properly flipped, so like when the original has the right arm lifted up that the pasted one then has the left arm lifted up etc.
Would probably need some work with getting the entity part's positioning and rotations and translating them properly onto the flipped parts.

### Alternatives

_No response_

### Anything Else?

Add any additional context you can provide below.