Stop drawing strokes when lineStyle width is set to NaN
Round Graphics lineStyle to pixel values
Remember drawing cursor position over Graphics drawing style changes
Separate fill from stroke geometry in Graphics drawing

This is a prerequisite for two things:
- Implementation of separate switching of fill and line styles while drawing a single shape
- "Fixing" the position of thin lines to always align on pixel boundaries, even if they should be 0.5px off
Merge pull request #1324 from tschneidereit/gts

Graphics drawing progress