Table toolbar presentation/dismissal issues

[stevengharris]

In environments with a non-hardware keyboard, the MarkupToolbar is presented as an inputAccessoryView with the keyboard. The TableToolbar is presented as a SubToolbar that extends from the MarkupToolbar. This approach works okay for the Mac, but it presents (pun intended) problems on dismissal. For example, when the TableSizer is presented, and the user drags across the grid, the TableSizer should be dismissed when the drag is complete. This doesn't work on iOS.

The second issue with the TableToolbar presentation is that when the MarkupToolbar is embedded in another view's toolbar along with other ToolbarItems, the SubToolbar type of style of extending from the MarkupToolbar just looks bad. The SubToolbar extends for the MarkupToolbar width, but the MarkupToolbar is embedded in a larger toolbar, so the SubToolbar is a kind of stub that extends below the larger toolbar and looks weird.

The TableToolbar should be presented as a .popover from the "insert table" button of the InsertToolbar. This behavior would also be consistent with the link and image presentation approach when those buttons are pressed.