Moving drawPath to GraphicsEx, validateNow-fix and Faster Fills

Three fixes that kind of got entangled. I feel bad, but I believe they
are of value:
1 - allowing validateNow to be called not only on render. Allows for
preparation of Graphic-classes before render
2 - Moving all drawPath and drawGraphicsData to GraphicsEx to save on
imports in Graphics
3 - Fill gets an added "addVertexInConvexShape"-API. Allows for much
faster convex, simple fills, skipping the expensive convertToSimple
method.  Working with large vertex fills through addVertex-calls gets an
order of magnitude faster.