update some deisng parameters and add new cases

lib/feather_case_wizard.rb

@@ -11,6 +11,7 @@ require "yaml"
 
 require "highline"
 
+require_relative "feather_case_wizard/prompting_ui"
 require_relative "feather_case_wizard/config"
 require_relative "feather_case_wizard/toolchain"
 require_relative "feather_case_wizard/package_builder"
@@ -23,4 +24,3 @@ module FeatherCaseWizard
   MODEL_SOURCE = ROOT.join("feather_case.scad").freeze
   RENDERER_SOURCE = ROOT.join("tools/render_stl_previews.py").freeze
 end
-