Simple logging implemented

Message now stores a copy of the content string
Use .nick() instead of .account() to get the users lowercase name (login name)

logging/loggingchannel.h

@@ -0,0 +1,42 @@
+#ifndef LOGGINGCHANNEL_H
+#define LOGGINGCHANNEL_H
+
+#include "messages/message.h"
+
+#include <QDateTime>
+#include <QFile>
+#include <QString>
+
+#include <memory>
+
+namespace chatterino {
+namespace logging {
+
+class Channel
+{
+public:
+    explicit Channel(const QString &_channelName,
+                     const QString &_baseDirectory);
+    ~Channel();
+
+    void append(std::shared_ptr<messages::Message> message);
+
+private:
+    QString generateOpeningString(
+        const QDateTime &now = QDateTime::currentDateTime()) const;
+    QString generateClosingString(
+        const QDateTime &now = QDateTime::currentDateTime()) const;
+
+    void appendLine(const QString &line);
+
+private:
+    QString channelName;
+    const QString &baseDirectory;
+    QString fileName;
+    QFile fileHandle;
+};
+
+}  // namespace logging
+}  // namespace chatterino
+
+#endif  // LOGGINGCHANNEL_H