Add option for modal tooltips instead of standard html titles

[samussiah]

consider modals as they're more immediate than the title attribute

[jwildfire]

I think this is worth doing, but not sure I want to program modal functionality from scratch. Maybe we add config.useModals with default:`false and then use an existing modal framework (which becomes an optional dependency) to implement?

[jwildfire]

Updated title to expand scope to cover other elements.

[jwildfire]

Just realized a hijacked this issue a bit. Will add a new issue to cover the specific use case for titles in control labels.