[CMD] Support dynamic trace (#7093)

Based on Hans Harder's patch.
Realize tracing cmd on console
output.
JIRA issue: CORE-6669
- Add FEATURE_DYNAMIC_TRACE
  feature.
- Add CmdTrace function.
- Re-define FIXME, ERR, WARN,
  and TRACE macros.
- Check CMDTRACE environment
  variable. If it was "ON", then enable
  dynamic trace.

base/shell/cmd/set.c

@@ -175,6 +175,13 @@ INT cmd_set(LPTSTR param)
         }
 
         *p++ = _T('\0');
+
+#ifdef FEATURE_DYNAMIC_TRACE
+        /* Check for dynamic TRACE ON/OFF */
+        if (!_tcsicmp(param, _T("CMDTRACE")))
+            g_bDynamicTrace = !_tcsicmp(p, _T("ON"));
+#endif
+
         if (!SetEnvironmentVariable(param, *p ? p : NULL))
         {
             retval = 1;