This change styles the nodes in the QtGraphView. Since Stylesheets can't be applied to QGraphicsItems, the style
implementation was done in the source files. The containers for public/protected/private nodes are now subclassed from
QtGraphNode as QtGraphNodeAccess, including a helper class QtAccessArrow for indicating the opened/colapsed state.
* updated spacings and colors in QtCodeView and QtCodeFile
* using Source Code Pro Regular (had to remove light cut from the Fonts folder because it got always used)
* updated syntax highlighted colors to fit design
* changed colors of highlights
* indent all QtCodeSnippets by maximum line number in QtCodeFile
* fixed syntax highlighting to work with sole multiline comment end
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