Add custom hotkeys. (#2340)

Co-authored-by: LosFarmosCTL <80157503+LosFarmosCTL@users.noreply.github.com>
Co-authored-by: Paweł <zneix@zneix.eu>
Co-authored-by: Felanbird <41973452+Felanbird@users.noreply.github.com>
Co-authored-by: Rasmus Karlsson <rasmus.karlsson@pajlada.com>

src/controllers/hotkeys/HotkeyHelpers.hpp

@@ -0,0 +1,11 @@
+#pragma once
+
+#include <QString>
+
+#include <vector>
+
+namespace chatterino {
+
+std::vector<QString> parseHotkeyArguments(QString argumentString);
+
+}  // namespace chatterino