modules: Remove Q

Q can be replaced with the perform module, and will still be available
as a third-party module for those who use the module and QuakeNet.

In general, the Q module only targets a single network not everyone may
use, the additional support and maintenance burden is not worth it.

References #786
Closes #1636 as wontfix
Closes #554 as wontfix

src/IRCNetwork.cpp

@@ -456,6 +456,20 @@ bool CIRCNetwork::ParseConfig(CConfig* pConfig, CString& sError,
             bool bModRet = LoadModule(sModName, sArgs, sNotice, sModRet);
 
             if (!bModRet) {
+                // Q is removed in znc 1.8
+                if (sModName == "q") {
+                    CUtils::PrintError(
+                        "NOTICE: [q] is unavailable, cannot load.");
+                    CUtils::PrintError(
+                        "NOTICE: [q] is removed in this release of ZNC. Please "
+                        "either remove it from your config or install it as a "
+                        "third party module with the same name.");
+                    CUtils::PrintError(
+                        "NOTICE: More info can be found on "
+                        "https://wiki.znc.in/Q");
+                    return false;
+                }
+
                 // XXX The awaynick module was retired in 1.6 (still available
                 // as external module)
                 if (sModName == "awaynick") {