SCP: Added generic output routine sim_printf to output to stdout and sim_log (and sim_deb when enabled)

The goals here being to simplify calling code while getting consistent output delivered everywhere it may be useful.

Modified most places which explicitly used sim_log or merely called printf to now avoid doing that and merely call sim_printf().

VAX/vax_lk.c

@@ -354,7 +354,7 @@ if (lk_rbuf[0] & 1) {                                   /* peripheral command */
             break;
 
         default:
-            printf ("lk: unknown cmd %02X\n", lk_rbuf[0]);
+            sim_printf ("lk: unknown cmd %02X\n", lk_rbuf[0]);
             break;
         }
     }