Libraries: Add missing headers

A C++ source file containing just
    #include <LibFoo/Bar.h>
should always compile cleanly.

This patch adds missing header inclusions that could have caused weird error
messages if they were used in a different context. Also, this confused QtCreator.

Userland/Libraries/LibAudio/Loader.h

@@ -30,6 +30,7 @@
 #include <AK/RefCounted.h>
 #include <AK/RefPtr.h>
 #include <AK/StringView.h>
+#include <LibAudio/Buffer.h>
 #include <LibCore/File.h>
 
 namespace Audio {

Userland/Libraries/LibC/sys/un.h

@@ -26,6 +26,7 @@
 
 #pragma once
 
+#include <bits/stdint.h>
 #include <sys/cdefs.h>
 
 __BEGIN_DECLS

Userland/Libraries/LibELF/Validation.h

@@ -26,6 +26,7 @@
 
 #pragma once
 
+#include <AK/String.h>
 #include <LibELF/exec_elf.h>
 
 namespace ELF {

Userland/Libraries/LibGUI/DragOperation.h

@@ -27,6 +27,7 @@
 #pragma once
 
 #include <AK/OwnPtr.h>
+#include <LibCore/MimeData.h>
 #include <LibCore/Object.h>
 #include <LibGUI/Forward.h>
 #include <LibGfx/Forward.h>

Userland/Libraries/LibGUI/FontPicker.h

@@ -27,6 +27,7 @@
 #pragma once
 
 #include <LibGUI/Dialog.h>
+#include <LibGfx/Font.h>
 #include <LibGfx/Forward.h>
 
 namespace GUI {

Userland/Libraries/LibGUI/ModelIndex.h

@@ -26,6 +26,7 @@
 
 #pragma once
 
+#include <AK/Format.h>
 #include <AK/Traits.h>
 #include <LibGUI/Forward.h>
 #include <LibGUI/ModelRole.h>

Userland/Libraries/LibGfx/ImageDecoder.h

@@ -30,6 +30,7 @@
 #include <AK/OwnPtr.h>
 #include <AK/RefCounted.h>
 #include <AK/RefPtr.h>
+#include <LibGfx/Bitmap.h>
 #include <LibGfx/Size.h>
 
 namespace Gfx {

Userland/Libraries/LibLine/Span.h

@@ -26,6 +26,8 @@
 
 #pragma once
 
+#include <stddef.h>
+
 namespace Line {
 
 class Span {

Userland/Libraries/LibTTF/Cmap.h

@@ -27,6 +27,7 @@
 #pragma once
 
 #include <AK/Span.h>
+#include <stdint.h>
 
 namespace TTF {
 

Userland/Libraries/LibWeb/DOM/EventDispatcher.h

@@ -27,6 +27,7 @@
 #pragma once
 
 #include <AK/Forward.h>
+#include <LibWeb/DOM/Event.h>
 #include <LibWeb/Forward.h>
 
 namespace Web::DOM {

Userland/Libraries/LibWeb/DOM/Timer.h

@@ -29,6 +29,7 @@
 #include <AK/Forward.h>
 #include <LibCore/Forward.h>
 #include <LibJS/Heap/Handle.h>
+#include <LibJS/Runtime/Function.h>
 #include <LibWeb/Forward.h>
 
 namespace Web::DOM {

Userland/Libraries/LibWeb/FontCache.h

@@ -29,6 +29,7 @@
 #include <AK/FlyString.h>
 #include <AK/HashMap.h>
 #include <AK/String.h>
+#include <LibGfx/Font.h>
 #include <LibGfx/Forward.h>
 
 struct FontSelector {

Userland/Libraries/LibWeb/Layout/SVGPathBox.h

@@ -27,6 +27,7 @@
 #pragma once
 
 #include <LibWeb/Layout/SVGGraphicsBox.h>
+#include <LibWeb/SVG/SVGPathElement.h>
 
 namespace Web::Layout {
 

Userland/Libraries/LibWeb/Page/EditEventHandler.h

@@ -26,6 +26,7 @@
 
 #pragma once
 
+#include <AK/Types.h>
 #include <LibWeb/Forward.h>
 
 namespace Web {

Userland/Libraries/LibWeb/Page/EventHandler.h

@@ -27,6 +27,7 @@
 #pragma once
 
 #include <AK/Forward.h>
+#include <AK/NonnullOwnPtr.h>
 #include <AK/WeakPtr.h>
 #include <Kernel/API/KeyCode.h>
 #include <LibGUI/Forward.h>

Userland/Libraries/LibWeb/Painting/PaintContext.h

@@ -26,6 +26,7 @@
 
 #pragma once
 
+#include <AK/Vector.h>
 #include <LibGfx/Forward.h>
 #include <LibGfx/Palette.h>
 #include <LibGfx/Rect.h>

Userland/Libraries/LibWeb/SVG/SVGContext.h

@@ -26,6 +26,9 @@
 
 #pragma once
 
+#include <AK/Vector.h>
+#include <LibGfx/Color.h>
+
 namespace Web {
 
 class SVGContext {

Userland/Libraries/LibWeb/StylePropertiesModel.h

@@ -28,6 +28,7 @@
 
 #include <AK/NonnullRefPtrVector.h>
 #include <LibGUI/Model.h>
+#include <LibWeb/CSS/StyleProperties.h>
 
 namespace Web {
 

Userland/Libraries/LibX86/ELFSymbolProvider.h

@@ -27,6 +27,7 @@
 #pragma once
 
 #include <LibELF/Image.h>
+#include <LibX86/Instruction.h>
 
 namespace X86 {