As much as possible I would like us to avoid having to go the with a global event listener on click/mouseover. For now I have removed all cases of `data-tooltip`, if we clearly identify a use case of a global event listener we might reconsider this.
The following changes are also included:
- by default tooltips won't attempt to focus first focusable element anymore
- tooltip will now use `cursor: pointer` by default
- a new service has been introduced: `InternalTooltip` which is responsible to track the current instance displayed by a `<DTooltip />`. Portal elements when replaced are not properly cleaned and I couldn't figure out a way to have a proper hook to ensure the previous `DTooltipInstance` is properly set as not expanded; this problem was very visible when using a tooltip as interactive and hovering another tooltip, which would replace the interactive tooltip as not closed.
1. Use `this.` instead of `{{action}}` where applicable
2. Use `{{fn}}` instead of `@actionParam` where applicable
3. Use non-`@` versions of class/type/tabindex/aria-controls/aria-expanded
4. Remove `btn` class (it's added automatically to all DButtons)
5. Remove `type="button"` (it's the default)
6. Use `concat-class` helper
