Add feature to select channels to log (#4302)

* Add checkbox for custom logging and table with channels to log on Logs page

* Add checkbox to enable and disable logging per channel

* Return from addMessage before logging if custom logging enabled and channel does not have logging enabled

* Use clang-format to fix formatting

* Add CHANGELOG.md entry

* Resolve PR comments

* Remove toggle for channels so any channel listed will be logged

* Move Only log channels listed below checkbox to just above table

* Fix formatting

* Re-order changelog

* ChannelLog constructor: Copy & move instead of const ref & copy

* ChannelLog::createEmpty: Curly brace initialize instead of repeating
name

* ChannelLog toString & createEmpty: nodiscard

* Use COUNT paradigm in model column

* Remove ChanneLoggingModel source file comments

* Use Column::Channel in getRowFromItem

* Rename `getItemFromRow` parameter and mark it as unused

* Curly brace initialize ChannelLog

* private & friend class the model

* Filter out channels to log using a set instead of iterating over a vector every time a message comes in

* Rename `ChannelLog::channel` member to `ChannelLog::channelName`

Also made it private

* mini comment on ChannelLog

Co-authored-by: Felanbird <41973452+Felanbird@users.noreply.github.com>
Co-authored-by: Rasmus Karlsson <rasmus.karlsson@pajlada.com>

src/singletons/Logging.hpp

@@ -1,11 +1,14 @@
 #pragma once
 
 #include "common/Singleton.hpp"
+#include "util/QStringHash.hpp"
+#include "util/ThreadGuard.hpp"
 
 #include <QString>
 
 #include <map>
 #include <memory>
+#include <unordered_set>
 
 namespace chatterino {
 
@@ -32,6 +35,10 @@ private:
     std::map<PlatformName,
              std::map<ChannelName, std::unique_ptr<LoggingChannel>>>
         loggingChannels_;
+
+    // Keeps the value of the `loggedChannels` settings
+    std::unordered_set<ChannelName> onlyLogListedChannels;
+    ThreadGuard threadGuard;
 };
 
 }  // namespace chatterino