added menu items that allow users to removed own-defined menu items; also load the .wrangler/elisp/wrangler_ext.el filewhen wrangler is switched on if such a file exists.
added menu items that allow users to removed own-defined menu items; also load the .wrangler/elisp/wrangler_ext.el filewhen wrangler is switched on if such a file exists.

andrzejsliwa/wrangler,arcusfelis/wrangler,prowessproject/wrangler,arcusfelis/wrangler,tdb/wrangler,bsmr-erlang/wrangler