Basic logging implemented

Implemented scuffed logging settings page
Add helper function to PathManager to create an arbitrary folder

src/singletons/loggingmanager.cpp

@@ -0,0 +1,61 @@
+#include "singletons/loggingmanager.hpp"
+#include "debug/log.hpp"
+#include "singletons/pathmanager.hpp"
+#include "singletons/settingsmanager.hpp"
+
+#include <QDir>
+#include <QStandardPaths>
+
+#include <unordered_map>
+
+namespace chatterino {
+namespace singletons {
+
+LoggingManager::LoggingManager()
+    : pathManager(PathManager::getInstance())
+{
+}
+
+LoggingManager &LoggingManager::getInstance()
+{
+    static LoggingManager instance;
+    return instance;
+}
+
+void LoggingManager::addMessage(const QString &channelName, messages::MessagePtr message)
+{
+    const auto &settings = singletons::SettingManager::getInstance();
+
+    if (!settings.enableLogging) {
+        return;
+    }
+
+    auto it = this->loggingChannels.find(channelName);
+    if (it == this->loggingChannels.end()) {
+        auto channel = new LoggingChannel(channelName, this->getDirectoryForChannel(channelName));
+        channel->addMessage(message);
+        this->loggingChannels.emplace(channelName, std::move(channel));
+    } else {
+        it->second->addMessage(message);
+    }
+}
+
+QString LoggingManager::getDirectoryForChannel(const QString &channelName)
+{
+    if (channelName.startsWith("/whispers")) {
+        return this->pathManager.whispersLogsFolderPath;
+    } else if (channelName.startsWith("/mentions")) {
+        return this->pathManager.mentionsLogsFolderPath;
+    } else {
+        QString logPath(this->pathManager.channelsLogsFolderPath + QDir::separator() + channelName);
+
+        if (!this->pathManager.createFolder(logPath)) {
+            debug::Log("Error creating channel logs folder for channel {}", channelName);
+        }
+
+        return logPath;
+    }
+}
+
+}  // namespace singletons
+}  // namespace chatterino