New commands (vertex deform and more)

[micheus]

I wanted make sure I wasn't reimplement an existing command somehow for my first commands, so I've been focusing on the deform submenu.

Hi edb
Good to see you are still around with some stuffs for Wings3D.

I'm not sure about the use of the last one since it may in terms of final look itself we can achieve a similar one using Move+Magnet:


But, this is only my though. Dan is who decides what can be added or not. We just make our PRs.