Missing tooltip features

[berenddeboer]

Tooltips are missing the following things:

• No support for persistent tooltips.
• Tooltip should be repositioned on anchor move.
• Support for tooltips on unbounded elements.
• Logic to position the caret relative to the tooltip (introduced in v11.
• Might not work on mobile devices (some touch support events were added in v11, which have not been ported).
• Not persistent tooltip should hide on scroll.