positional standoff sidewall support added and ongoing code cleanup and reorg.

lib/art.scad

@@ -1,12 +1,34 @@
 /*
+    This file is part of SBC Case Builder https://github.com/hominoids/SBC_Case_Builder
+    Copyright 2022,2023,2024 Edward A. Kisiel hominoid@cablemi.com
 
-    art(scale_d1,type,size_z)
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
 
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>
+    Code released under GPLv3: http://www.gnu.org/licenses/gpl.html
+
+
+           NAME: art
+    DESCRIPTION: create artwork using dxf or svf
+           TODO: none
+
+          USAGE: art(scale_d1, size_z, type)
+
+                     scale_d1 = amount to scale file
+                       size_z = floor thickness
+                         type = file name
 */
 
-/* art work module */
-module art(scale_d1,size_z,type) {
-    
+module art(scale_d1, size_z, type) {
+
     linear_extrude(height = size_z) import(file = type, scale=scale_d1);
 
 }