Make panel slide in  from the left when revealed.

Add some nice animation when the side panel is revealed.
Add tooltip to positioning callback arguments.

It is handy to have if the position is being calculated with
getBoundingClientRect(). As one can undo the transformations applied
in the tooltip function.
Re-add tooltips to callgraph chart.

Get them positioned correctly as long as the screen has not been
scrolled. The offset handling is still a bit tricky and isn't fully
working yet.
Position tooltips correctly when the window has been scrolled.