debug::Log can now be used instead of qDebug()

Usage:
```
QString string("world");
debug::Log("hello: {}", string);
```

src/debug/log.hpp

@@ -0,0 +1,37 @@
+#pragma once
+
+#include "fmt/format.h"
+
+#include <QDebug>
+#include <QTime>
+
+namespace chatterino {
+namespace debug {
+
+namespace detail {
+
+static void _log(const std::string &message)
+{
+    qDebug().noquote() << QTime::currentTime().toString("hh:mm:ss.zzz") << message.c_str();
+}
+
+}  // namespace detail
+
+template <typename... Args>
+inline void Log(const std::string &formatString, Args &&... args)
+{
+    detail::_log(fmt::format(formatString, std::forward<Args>(args)...));
+}
+
+}  // namespace debug
+}  // namespace chatterino
+
+namespace fmt {
+
+// format_arg for QString
+inline void format_arg(BasicFormatter<char> &f, const char *&, const QString &v)
+{
+    f.writer().write("\"{}\"", v.toStdString());
+}
+
+}  // namespace fmt