remove models directory and switch to generating them via script

expand.rb

@@ -1,27 +1,3 @@
+require './openscad.rb'
 
-def expand(filename)
-  lines = File.readlines(filename)
-  old_dir = Dir.getwd
-
-  Dir.chdir File.dirname(filename)
-  lines = lines.flat_map do |line|
-    if line =~ /(include|use)\s*<(.*)>/
-      # File.readlines("./#{$2}")
-      expand("./#{$2}")
-    # in lieu of actually implementing `use`, we can just cull this final line from key.scad
-    elsif line =~ /example\_key\(\);/
-      ""
-    else
-      line
-    end
-  end
-
-  Dir.chdir old_dir
-
-  lines
-end
-
-lines = expand(ARGV[1] || 'customizer_base.scad')
-
-f = File.open('customizer.scad', 'w')
-f.write lines.join
+OpenSCAD::expand_openSCAD_file(ARGV[1] || 'customizer_base.scad', 'customizer.scad')