added 'abort' & QSE_AWK_ABORT to awk.

added a new sed command 'C' that resembles the cut utility
dropped the cut utility.
added qse_str_nrcat()/qse_mbs_nrcat()/qse_wcs_nrcat()

qse/lib/awk/run.c

@@ -2291,7 +2291,7 @@ static int run_exit (qse_awk_rtx_t* run, qse_awk_nde_exit_t* nde)
 		qse_awk_rtx_refupval (run, val);
 	}
 
-	run->exit_level = EXIT_GLOBAL;
+	run->exit_level = (nde->abort)? EXIT_ABORT: EXIT_GLOBAL;
 	return 0;
 }