Replace boost::optional with std::optional (#4877)

src/common/Args.hpp

@@ -2,9 +2,10 @@
 
 #include "common/WindowDescriptors.hpp"
 
-#include <boost/optional.hpp>
 #include <QApplication>
 
+#include <optional>
+
 namespace chatterino {
 
 /// Command line arguments passed to Chatterino.
@@ -18,12 +19,12 @@ public:
     bool shouldRunBrowserExtensionHost{};
     // Shows a single chat. Used on windows to embed in another application.
     bool isFramelessEmbed{};
-    boost::optional<unsigned long long> parentWindowId{};
+    std::optional<unsigned long long> parentWindowId{};
 
     // Not settings directly
     bool dontSaveSettings{};
     bool dontLoadMainWindow{};
-    boost::optional<WindowLayout> customChannelLayout;
+    std::optional<WindowLayout> customChannelLayout;
     bool verbose{};
 
 private: