added qse_awk_rtx_pushrcb() and qse_awk_rtx_poprcb().

deleted qse_awk_rtx_setrcb() and qse_awk_rtx_getrcb().
added 'close' to qse_awk_rcb_t
added builtin functions 'setenc' and 'unsetenc' to awk/std.c
added qse_getcmgrbyname()
added builtin functions 'setenc' and 'unsetenc' to awk/StdAwk.cpp

qse/lib/cmn/htb.c

@@ -250,7 +250,7 @@ static mancbs_t mancbs[] =
 	}
 };
 
-const mancbs_t* qse_htb_mancbs (mancbs_kind_t kind)
+const mancbs_t* qse_gethtbmancbs (mancbs_kind_t kind)
 {
 	return &mancbs[kind];
 };