Improve editing of hotkeys (#4628)

Co-authored-by: Rasmus Karlsson <rasmus.karlsson@pajlada.com>

src/controllers/hotkeys/HotkeyHelpers.hpp

@@ -1,5 +1,8 @@
 #pragma once
 
+#include "controllers/hotkeys/ActionNames.hpp"
+
+#include <boost/optional/optional.hpp>
 #include <QString>
 
 #include <vector>
@@ -7,5 +10,7 @@
 namespace chatterino {
 
 std::vector<QString> parseHotkeyArguments(QString argumentString);
+boost::optional<ActionDefinition> findHotkeyActionDefinition(
+    HotkeyCategory category, const QString &action);
 
 }  // namespace chatterino