When the toolbox is hidden and due to a ReactFocusLock instance the
focus is returned to the toolbox the whole page scrolls to the toolbox
which is positioned outside of the viewport in the bottom.
Then when the animation for displaying the toolbox is started the
scenario looks like the large video is jumping.
Now we don't return the focus from ReactFocusLock to elements which are
not part of the viewport.
Create Tooltip component
Fix Popover positioning calculations
Add margins to popover
Remove @atlaskit/tooltip
Update all components to use the new Tooltip component
Added tooltip actions and reducers for the following functionality: when a user hovers over an element is sees the tooltip for that element and then hovers another element that has a tooltip, instead of using the delay and animations we just unmount the current tooltip and mount the next one immediately
