LibGUI: Add support for changing window title

userspace/libraries/LibGUI/include/LibGUI/Packet.h

@@ -165,6 +165,7 @@ namespace LibGUI
 		WindowSetMouseCapture,
 		WindowSetSize,
 		WindowSetFullscreen,
+		WindowSetTitle,
 
 		DestroyWindowEvent,
 		CloseWindowEvent,
@@ -230,6 +231,11 @@ namespace LibGUI
 			bool, fullscreen
 		);
 
+		DEFINE_PACKET(
+			WindowSetTitle,
+			BAN::String, title
+		);
+
 	}
 
 	namespace EventPacket

userspace/libraries/LibGUI/include/LibGUI/Window.h

@@ -68,6 +68,7 @@ namespace LibGUI
 
 		void set_mouse_capture(bool captured);
 		void set_fullscreen(bool fullscreen);
+		void set_title(BAN::StringView title);
 
 		void set_position(int32_t x, int32_t y);