[Lazarus] Move simple types away from Graphics unit

[Alexander Klenin]

I am trying to write widgetset-independent version of TAChart
(and encourage BGRABitmap author to do the same).

To achieve that, Graphics unit should be removed from the dependencies.
However, it contains various enumerations which I would like to continue using.
For example: TFontStyle, TFontStyles, TPenEndCap, TPenJoinStyle.

I would like those definitions moved to GraphType or, better yet, to FPCanvas.

-- 
Alexander S. Klenin