changed all "homedecor_" variable and function names to "homedecor."

(underscore -> period).  Similarly for intllib calls and the DEBUG variable.

shutters.lua

@@ -2,8 +2,8 @@
 
 -- Boilerplate to support localized strings if intllib mod is installed.
 local S
-if intllib_modpath then
-    dofile(intllib_modpath.."/intllib.lua")
+if homedecor.intllib_modpath then
+    dofile(homedecor.intllib_modpath.."/intllib.lua")
     S = intllib.Getter(minetest.get_current_modname())
 else
     S = function ( s ) return s end