missing includes in Base, App and Gui headers (#23854)

* missing includes in Base, App and Gui headers

header should be self contained

* use cstddef header instead of stddef.h

Co-authored-by: Chris Hennes <chennes@pioneerlibrarysystem.org>

---------

Co-authored-by: Chris Hennes <chennes@pioneerlibrarysystem.org>

src/App/ExpressionVisitors.h

@@ -25,6 +25,8 @@
 
 #include "Expression.h"
 
+#include "Document.h"
+
 namespace App
 {
 

src/Base/Sequencer.h

@@ -24,6 +24,9 @@
 #ifndef BASE_SEQUENCER_H
 #define BASE_SEQUENCER_H
 
+#include <cstddef>
+
+#include <FCGlobal.h>
 
 namespace Base
 {

src/Base/XMLTools.h

@@ -30,6 +30,8 @@
 #include <xercesc/util/TransService.hpp>
 #include <xercesc/framework/MemoryManager.hpp>
 
+#include <FCGlobal.h>
+
 #ifndef XERCES_CPP_NAMESPACE_BEGIN
 #define XERCES_CPP_NAMESPACE_QUALIFIER
 namespace XERCES_CPP_NAMESPACE

src/Gui/CommandActionPy.h

@@ -29,6 +29,7 @@
 
 namespace Gui
 {
+class Command;
 
 class CommandActionPy : public Py::PythonClass<CommandActionPy>
 {

src/Gui/MDIViewPy.h

@@ -29,6 +29,8 @@
 #include <QPointer>
 #include <FCGlobal.h>
 
+#include "MDIView.h"
+
 namespace Gui {
 class MDIView;
 

src/Gui/ManualAlignment.h

@@ -24,7 +24,9 @@
 #ifndef GUI_MANUALALIGNMENT_H
 #define GUI_MANUALALIGNMENT_H
 
+#include <QObject>
 #include <QPointer>
+
 #include <Base/BoundBox.h>
 #include <Base/Placement.h>
 #include <Base/Vector3D.h>

src/Gui/NotificationArea.h

@@ -32,6 +32,11 @@
 #include <Base/Observer.h>
 #include <Base/Parameter.h>
 
+namespace App
+{
+    class Document;
+}
+
 namespace Gui
 {
 

src/Gui/NotificationBox.h

@@ -25,6 +25,10 @@
 
 #include <type_traits>
 
+#include <QFont>
+#include <QPoint>
+#include <QString>
+
 namespace Gui
 {
 

src/Gui/PreferencePackManager.h

@@ -27,6 +27,10 @@
 #include <string>
 #include <mutex>
 
+#include <QMetaType>
+
+#include <FCGlobal.h>
+
 #include "App/Metadata.h"
 
 namespace Gui {

src/Gui/SoFCDB.h

@@ -28,6 +28,7 @@
 #include <string>
 #include <Inventor/C/basic.h>
 
+#include <FCGlobal.h>
 
 class SoNode;
 class SoGroup;

src/Gui/SoFCVectorizeU3DAction.h

@@ -24,9 +24,11 @@
 #define GUI_SOFCVECTORIZEU3DACTION_H
 
 #include <fstream>
+
 #include <Inventor/annex/HardCopy/SoVectorizeAction.h>
 #include <Inventor/annex/HardCopy/SoVectorOutput.h>
 
+#include <FCGlobal.h>
 
 namespace Gui {
 

src/Gui/TaskDlgRelocation.h

@@ -27,9 +27,10 @@
 #include <Gui/TaskView/TaskDialog.h>
 #include <Gui/TaskView/TaskView.h>
 
+#include <FCGlobal.h>
 
-class Ui_DlgLocationPos;
-class ui_DlgLocationAngle;
+class Ui_Position;
+class Ui_Angle;
 
 namespace Gui {
 

src/Gui/TaskTransform.h

@@ -29,6 +29,8 @@
 #include "ViewProviderDragger.h"
 
 #include <Base/ServiceProvider.h>
+
+#include <App/Application.h>
 #include <App/Services.h>
 
 class SoDragger;

src/Gui/WaitCursor.h

@@ -23,6 +23,7 @@
 #ifndef GUI_WAIT_CURSOR_H
 #define GUI_WAIT_CURSOR_H
 
+#include <FCGlobal.h>
 
 namespace Gui {