Disable legacy encoding mode when modpython is loaded.

Python is not happy when using non-unicode text as str.

Fix #1229

src/Client.cpp

@@ -384,7 +384,7 @@ void CClient::AcceptLogin(CUser& User) {
     SetTimeout(CIRCNetwork::NO_TRAFFIC_TIMEOUT, TMO_READ);
 
     SetSockName("USR::" + m_pUser->GetUserName());
-    SetEncoding(m_pUser->GetClientEncoding());
+    SetEncoding(CZNC::Get().FixupEncoding(m_pUser->GetClientEncoding()));
 
     if (!m_sNetwork.empty()) {
         m_pNetwork = m_pUser->FindNetwork(m_sNetwork);

src/IRCSock.cpp

@@ -91,7 +91,7 @@ CIRCSock::CIRCSock(CIRCNetwork* pNetwork)
     EnableReadLine();
     m_Nick.SetIdent(m_pNetwork->GetIdent());
     m_Nick.SetHost(m_pNetwork->GetBindHost());
-    SetEncoding(m_pNetwork->GetEncoding());
+    SetEncoding(CZNC::Get().FixupEncoding((m_pNetwork->GetEncoding())));
 
     m_mueChanModes['b'] = ListArg;
     m_mueChanModes['e'] = ListArg;

src/znc.cpp

@@ -72,6 +72,7 @@ CZNC::CZNC()
       m_lpConnectQueue(),
       m_pConnectQueueTimer(nullptr),
       m_uiConnectPaused(0),
+      m_uiForceEncoding(0),
       m_sConnectThrottle(),
       m_bProtectWebSessions(true),
       m_bHideVersion(false) {
@@ -2071,6 +2072,16 @@ void CZNC::ResumeConnectQueue() {
     }
 }
 
+void CZNC::ForceEncoding() { m_uiForceEncoding++; }
+void CZNC::UnforceEncoding() { m_uiForceEncoding--; }
+bool CZNC::IsForcingEncoding() const { return m_uiForceEncoding; }
+CString CZNC::FixupEncoding(const CString& sEncoding) const {
+    if (sEncoding.empty() && m_uiForceEncoding) {
+        return "UTF-8";
+    }
+    return sEncoding;
+}
+
 void CZNC::AddNetworkToQueue(CIRCNetwork* pNetwork) {
     // Make sure we are not already in the queue
     if (std::find(m_lpConnectQueue.begin(), m_lpConnectQueue.end(), pNetwork) !=