transperancy: Make the user aware that DEBUG mode is enabled.

src/IRCNetwork.cpp

@@ -23,6 +23,7 @@
 #include <znc/Chan.h>
 #include <znc/Query.h>
 #include <znc/Message.h>
+#include <znc/ZNCDebug.h>
 #include <algorithm>
 #include <memory>
 
@@ -724,6 +725,11 @@ void CIRCNetwork::ClientConnected(CClient* pClient) {
         pClient->PutStatus(
             "You are currently disconnected from IRC. "
             "Use 'connect' to reconnect.");
+
+    if (CDebug::Debug()) {
+        pClient->PutStatus("ZNC is presently running in DEBUG mode. Sensitive"
+            " data during your current session may be exposed to the host.");
+    }
 }
 
 void CIRCNetwork::ClientDisconnected(CClient* pClient) {