wplua: improve gvariant <-> lua conversion functions

* Add more generic lua -> gvariant conversion
* Cleanup the gvariant -> lua function and rename it

modules/module-lua-scripting.c

@@ -41,7 +41,7 @@ execute_script (lua_State *L, struct ScriptData * s, GError ** error)
 {
   int nargs = 0;
   if (s->args) {
-    wplua_gvariant_to_table (L, s->args);
+    wplua_gvariant_to_lua (L, s->args);
     nargs++;
   }
   return wplua_load_path (L, s->filename, nargs, 0, error);