Fix object drawing code

[pmachapman]

The insert object code has some bugs that need to be fixed for each of the editors:

1. When drawing a form control, allow clicking of the selected object ribbon button to unselect the button, and remove the drawing cursor (cancel drawing mode)
2. When that is fixed, update the other editors to act in the same way as the insert form control buttons, particularly:
   a. Show the ribbon button as selected when drawing mode is on
   b. Allow deselection of the drawing mode by clicking the ribbon button
   c. Allow interactions with the one or many objects already on the page that are already selected

[pmachapman]

Fixed in commit b8dd495.