WindowServer: Rename WSEvent to WSMessage.

Also do the same for WSMessageLoop and WSMessageReceiver. More to come.

WindowServer/WSEventLoop.h

@@ -1,45 +0,0 @@
-#pragma once
-
-#include "WSEvent.h"
-#include <AK/Lock.h>
-#include <AK/OwnPtr.h>
-#include <AK/Vector.h>
-
-class WSEventReceiver;
-class Process;
-
-class WSEventLoop {
-public:
-    WSEventLoop();
-    ~WSEventLoop();
-
-    int exec();
-
-    void post_event(WSEventReceiver* receiver, OwnPtr<WSEvent>&&);
-
-    static WSEventLoop& the();
-
-    static void initialize();
-
-    bool running() const { return m_running; }
-    Process& server_process() { return *m_server_process; }
-
-private:
-    void wait_for_event();
-    void drain_mouse();
-    void drain_keyboard();
-
-    Lock m_lock;
-
-    struct QueuedEvent {
-        WSEventReceiver* receiver { nullptr };
-        OwnPtr<WSEvent> event;
-    };
-    Vector<QueuedEvent> m_queued_events;
-
-    Process* m_server_process { nullptr };
-    bool m_running { false };
-
-    int m_keyboard_fd { -1 };
-    int m_mouse_fd { -1 };
-};