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Fixed rendering of line node in LineSegments mode. If the color was set via MaterialNode::set_color() function, OpenFlipper crashed when rendering the line. This was due to the fact that one was supposed to set as many colors (via add_color()) as points. It was never checked whether we reached the end of the color vector. So I changed this such that as long as colors are set for the vertices, those are used. And as soon as we reach the end of the colors vector, the last used color is set for rendering the line. If no color is set at all, it defaults to white.

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Fixed a bug in MeshNode2T that would permanently change the depth comparison function instead of only temporarily

Changed scenegraph nodes to use new GLState getter/setter for depth comparison function

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Moved depth_func_ from BaseNode to GL_State since most nodes don't use this. Updated all nodes to reflect this, especially LineNode which can now be set to be "always on top" as is desired by the lasso selection.

Fixed a crash in Lasso Selection that would occur if the line was not properly closed.

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GlutPrimitiveNode: float -> double, can handle more than one primitive now

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