Base: [skip ci] Optimize includes to reduce compile time

src/Base/CoordinateSystem.cpp

@@ -25,6 +25,7 @@
 
 #include "CoordinateSystem.h"
 #include "Exception.h"
+#include "Matrix.h"
 
 
 using namespace Base;

src/Base/Placement.cpp

@@ -23,6 +23,7 @@
 #include "PreCompiled.h"
 
 #include "Placement.h"
+#include "Matrix.h"
 #include "Rotation.h"
 #include "DualQuaternion.h"
 

src/Base/Placement.h

@@ -23,7 +23,6 @@
 #ifndef BASE_PLACEMENT_H
 #define BASE_PLACEMENT_H
 
-#include "Matrix.h"
 #include "Rotation.h"
 #include "Vector3D.h"
 
@@ -31,6 +30,7 @@
 namespace Base {
 
 class DualQuat;
+class Matrix4D;
 
 /**
  * The Placement class.

src/Base/Tools.h

@@ -35,7 +35,6 @@
 #include <string>
 #include <boost_signals2.hpp>
 #include <QString>
-#include <QObject>
 
 // ----------------------------------------------------------------------------