Fix issues with annotation tooltip #49
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This PR fixes two issue with the annotation tooltip:
The tooltip can now display html code and not just plain text.
The tooltip can no longer grow outside of the screen.
For this it calculates the tooltips distance to the edge of the screen and sets its maximum size accordingly.
Text gets broken up at the spaces or other seperator symbols if possible, otherwise an inword break could be inserted.
If the broken up text is too long to be fully displayed, since the tooltip would grow out of the bottom of the page, a scrollbar will be displayed.