Mute, hide or deactivate/reactivate OBJECTS in SPACE window

[rolandcahen]

It is important to be able to turn off an on any OBJECT in the SPACE window to see what you do when constructing a space. For example some other OBJECTS will be right in the middle of your view when you try to position your big OBJECT, or one sound is making you mad, etc.
So we could have just one toggle for esach OBJECT on/off or a MUTE toggle for sound and a HIDE toggle for visibility, physics, etc.

[jonlab]

I think that a ON/OFF toggle is ok for now. I am working on that.