Several visual tweaks to node links to make them overall fit in better with the look of the node editor: - Change the link thickness with the zoom level to a certain degree. - Remove the fuzziness of the node link and its shadow/outline. - The link outline color can now be made transparent. - Add circles at the end of dragged links when connecting to sockets. - Improve the banding of the color interpolation along the link. - Adjust the spacing of dashes along straight node links. Reviewed By: Pablo Vazquez, Hans Goudey Differential Revision: http://developer.blender.org/D15036