object.lisp: Find object function basing on inheritage

So that function/method cache can be shared among object classes.
Merge pull request #42 from hying-caritas/object-heirachy

object.lisp: Find object function basing on inheritage
Remove check/description from translator

Unused now.  Can be added back when it is actually used.
Merge pull request #43 from hying-caritas/remove_trans_check_desc

Remove check/description from translator