add svg stamp support

svg/main.scad

@@ -0,0 +1,41 @@
+/* [Main design variables] */
+file = "svg/all_connectors_are_beautiful.svg";
+id_front = "usba";
+id_back = "usba-back";
+
+/* [front params] */
+img_depth = 1.5;
+img_scale = 1;
+img_offset = 0;
+
+/* [back params] */
+
+base_thickness = 1;
+
+/* [hidden] */
+
+
+scale([-1,1,1])
+stamp();
+
+translate([40,0,0])
+%stamp();
+
+
+module stamp()
+{
+union()
+{
+    translate(v = [img_offset,img_offset,0])
+        scale([img_scale,img_scale,1])
+            linear_extrude(height = base_thickness)
+            import(file, id=id_back);
+
+    translate(v = [img_offset,img_offset,0])
+        scale([img_scale,img_scale,1])
+        color("white")
+            linear_extrude(height = base_thickness+img_depth)
+            import(file, id=id_front);
+}
+}
+