cmake: set warning and error options

The set is far from perfect, but guards against common errors with GCC.

src/webui/abstractwebapplication.cpp

@@ -121,7 +121,7 @@ Http::Response AbstractWebApplication::processRequest(const Http::Request &reque
         print(QObject::tr("Your IP address has been banned after too many failed authentication attempts."), Http::CONTENT_TYPE_TXT);
     }
     else {
-        processRequest();
+        doProcessRequest();
     }
 
     return response();

src/webui/abstractwebapplication.h

@@ -54,10 +54,10 @@ public:
     explicit AbstractWebApplication(QObject *parent = 0);
     virtual ~AbstractWebApplication();
 
-    Http::Response processRequest(const Http::Request &request, const Http::Environment &env);
+    Http::Response processRequest(const Http::Request &request, const Http::Environment &env) final;
 
 protected:
-    virtual void processRequest() = 0;
+    virtual void doProcessRequest() = 0;
 
     bool isBanned() const;
     int failedAttempts() const;

src/webui/webapplication.cpp

@@ -814,7 +814,7 @@ bool WebApplication::isPublicScope()
     return (scope_ == DEFAULT_SCOPE || scope_ == VERSION_INFO);
 }
 
-void WebApplication::processRequest()
+void WebApplication::doProcessRequest()
 {
     scope_ = DEFAULT_SCOPE;
     action_ = DEFAULT_ACTION;

src/webui/webapplication.h

@@ -103,7 +103,7 @@ private:
     QString action_;
     QStringList args_;
 
-    void processRequest();
+    void doProcessRequest() override;
 
     bool isPublicScope();
     void parsePath();