Compact snaps and constraints window

This is a compact version of the default window "Grid and Snap settings" to use during massive modelling sessions, without covering a lot of space on the screen. Furthermore there is a "constraints section" to easily switch between all the possible options. All the changes into this window will affect the default window "Grid and Snap settings" and vice versa.

• Right mouse button: clicking the right mouse button on the "snap" or "constraints" buttons, will open the default window "Grid and Snap settings"
• Display rubber band:there is a built in function that automatically activate the "Display rubber band" option when the user press the "snap" button.