Improve snapping

add possibility to change snapping options while you in modal mode. For example, snapping enabled to vertices , i press "g" to move, but need change snap to edges while keep moving and i press some hotkey and snap options change to edges, without leaving the transformation mode.

Hotkey map:

G- move

modal map for move:

V -snap to vertexes

E -snap to edges

F -snap to faces

O -snap to volume

C -snap to closest

M -snap to medeian

N -snap to center (C -taken by center, E -taken by edges, ceNter)

I - project individual elements

Hold Alt - align rotation

and same way make modal options for another transformations, rotations and scale