Draft: Small layer improvements

- Added 'Print Line Color' property
- Added 'Add new layer' context menu action to layers group

src/Mod/Draft/draftfunctions/svg.py

@@ -478,7 +478,12 @@ def get_svg(obj,
         else:
             stroke = utils.get_rgb(color)
     elif App.GuiUp:
-        if hasattr(obj, "ViewObject"):
+        # find print color
+        pc = get_print_color(obj)
+        if pc:
+            stroke = utils.get_rgb(pc)
+        # get line color
+        elif hasattr(obj, "ViewObject"):
             if hasattr(obj.ViewObject, "LineColor"):
                 stroke = utils.get_rgb(obj.ViewObject.LineColor)
             elif hasattr(obj.ViewObject, "TextColor"):
@@ -918,6 +923,17 @@ def get_svg(obj,
     return svg
 
 
+def get_print_color(obj):
+    """returns the print color of the parent layer, if available"""
+    for parent in obj.InListRecursive:
+        if (hasattr(parent,"ViewObject")
+                and hasattr(parent.ViewObject,"UsePrintColor")
+                and parent.ViewObject.UsePrintColor):
+            if hasattr(parent.ViewObject,"LinePrintColor"):
+                return parent.ViewObject.LinePrintColor
+    return None
+
+
 def getSVG(obj,
            scale=1, linewidth=0.35, fontsize=12,
            fillstyle="shape color", direction=None,