Added clip creation support 🎬 (#2271)

You can create clips with `/clip` command, `Alt+X` keybind or `Create a clip` option in split header's context menu. This requires a new authentication scope so re-authentication will be required to use it.

Co-authored-by: Leon Richardt <leon.richardt@gmail.com>
Co-authored-by: pajlada <rasmus.karlsson@pajlada.com>

src/messages/Link.hpp

@@ -21,7 +21,8 @@ public:
         AutoModDeny,
         OpenAccountsPage,
         JumpToChannel,
-        Reconnect
+        Reconnect,
+        CopyToClipboard,
     };
 
     Link();