Use per-instance hideOnClick handler

[atomiks]

This removes the global click listener in favor of adding one for each instance. This better supports nesting tooltips (e.g. a popover containing buttons with tooltips on them).

• Needs to be added in both scheduleShow() (triggered by event listeners) and show() (triggered programmatically)
• Remove checkHideOnClick option from HideAllOptions - this was only for internal use due to the global click listener and was not documented for use
• Fix in group.ts for supporting this better