Fixed typo in css (thanx to José)
added copyright info
this and that…nothing special
Added a new Symbol class that extends Region and therefor added all symbols as css styles which makes the code much cleaner. Also made some improvements in the RadialMenu related to unnecessary nodes etc.

Now all Symbols are available as StackPanes, Canvas nodes or Regions. I think I will remove the StackPane version and will keep the Canvas and Region styles in the future.