Everywhere: Add semantically-missing includes

For example, FindInFilesWidget.h mentions GUI::TableView, but did not include
it. On the other hand, all source files that include FindInFilesWidget.h
also include TableView.h, so the issue is only cosmetical.

Userland/DevTools/HackStudio/FindInFilesWidget.h

@@ -27,6 +27,7 @@
 #pragma once
 
 #include <LibGUI/Button.h>
+#include <LibGUI/TableView.h>
 #include <LibGUI/TextBox.h>
 #include <LibGUI/Widget.h>
 

Userland/Services/WindowServer/Button.h

@@ -28,6 +28,7 @@
 
 #include <AK/Function.h>
 #include <AK/Weakable.h>
+#include <LibGfx/Bitmap.h>
 #include <LibGfx/Forward.h>
 #include <LibGfx/Rect.h>
 

Userland/Services/WindowServer/ClientConnection.h

@@ -35,6 +35,7 @@
 #include <LibGfx/Bitmap.h>
 #include <LibIPC/ClientConnection.h>
 #include <WindowServer/Event.h>
+#include <WindowServer/Menu.h>
 #include <WindowServer/WindowClientEndpoint.h>
 #include <WindowServer/WindowServerEndpoint.h>
 

Userland/Services/WindowServer/Window.h

@@ -33,6 +33,7 @@
 #include <LibGfx/Bitmap.h>
 #include <LibGfx/DisjointRectSet.h>
 #include <LibGfx/Rect.h>
+#include <WindowServer/Cursor.h>
 #include <WindowServer/WindowFrame.h>
 #include <WindowServer/WindowType.h>