IFC: import helper, add method to convert IFC color to RGB col

src/Mod/Arch/importIFCHelper.py

@@ -449,6 +449,20 @@ def getColorFromMaterial(material):
     return None
 
 
+def color2colorRGB(color_data):
+
+    if color_data is None:
+        return None
+
+    color_rgb = [
+        int(round(color_data[0]*255, 0)),
+        int(round(color_data[1]*255, 0)),
+        int(round(color_data[2]*255, 0))
+    ]  # int(159.99) would return 159 not 160, thus round
+
+    return color_rgb
+
+
 def getColorFromStyledItem(styled_item):
     """Get color from the IfcStyledItem.