Move, Rotate, Scale on selections

[7Jaws9Eyes]

Are there plans to make the manipulations tools work on selections? ive been playing around with trying to implement it myself but i couldnt get it done. changing xyz coordinates in splatData seems not the way to go 😆

Creating a new asset from a selection and loading it along side the root asset seems like a huge hassle and has some issues with rendering where from some angles things can become invisble or rendered on the wrong plane when assets overlap.

[willeastcott]

Fixed by #217