feat(wm): add toggle-focus-follows-mouse cmd

Decided there should be a quick way to toggle the native ffm
functionality, it gets especially annoying when trying to click drop
downs from the system tray etc.

re #7

komorebi-core/src/lib.rs

@@ -66,6 +66,7 @@ pub enum SocketMessage {
     IdentifyTrayApplication(ApplicationIdentifier, String),
     State,
     FocusFollowsMouse(bool),
+    ToggleFocusFollowsMouse,
 }
 
 impl SocketMessage {