widgets

When the viewer's projection mode (orthographic/perspective) is switched, the coordinate system node now switches to the same mode.

Note: The projection mode of the coordinate system node can still be set individually

closes #870

git-svn-id: http://www.openflipper.org/svnrepo/OpenFlipper/branches/Free@14719 383ad7c9-94d9-4d36-a494-682f7c89f535