Fix QPainterPath-related compilation errors in Qt 5.15

Some include of QPainterPath was removed in Qt, causing errors like:

easingpane\easinggraph.cpp(258): error C2079: 'path' uses undefined class 'QPainterPath'
easingpane\easinggraph.cpp(275): error C2027: use of undefined type 'QPainterPath'
easingpane\easinggraph.cpp(305): error C2664: 'void QPainter::drawPath(const QPainterPath &)': cannot convert argument 1 from 'int'
to 'const QPainterPath &'
easingpane\easinggraph.cpp(305): note: Reason: cannot convert from 'int' to 'const QPainterPath'
easingpane\easinggraph.cpp(305): note: use of undefined type 'QPainterPath'
...

Add the missing include statements.

Change-Id: I4f3383cbcec891a52480a683c9c76ed5deee2b2a
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/libs/modelinglib/qmt/stereotype/shapepaintvisitor.cpp

@@ -27,6 +27,8 @@
 
 #include "shapes.h"
 
+#include <QPainterPath>
+
 namespace qmt {
 
 ShapePaintVisitor::ShapePaintVisitor(QPainter *painter, const QPointF &scaledOrigin, const QSizeF &originalSize,

src/libs/qmleditorwidgets/easingpane/easingcontextpane.cpp

@@ -30,6 +30,7 @@
 
 #include <QGraphicsPixmapItem>
 #include <QGraphicsScene>
+#include <QPainterPath>
 #include <QPropertyAnimation>
 #include <QSequentialAnimationGroup>
 

src/libs/qmleditorwidgets/easingpane/easinggraph.cpp

@@ -26,6 +26,7 @@
 #include "easinggraph.h"
 
 #include <QPainter>
+#include <QPainterPath>
 #include <QStyleOptionGraphicsItem>
 #include <math.h>
 

src/plugins/coreplugin/fancyactionbar.cpp

@@ -38,6 +38,7 @@
 #include <QEvent>
 #include <QMouseEvent>
 #include <QPainter>
+#include <QPainterPath>
 #include <QPixmapCache>
 #include <QPropertyAnimation>
 #include <QStyle>

src/plugins/coreplugin/manhattanstyle.cpp

@@ -43,6 +43,7 @@
 #include <QLineEdit>
 #include <QMenuBar>
 #include <QPainter>
+#include <QPainterPath>
 #include <QPixmap>
 #include <QStatusBar>
 #include <QStyleFactory>

src/plugins/texteditor/texteditor.cpp

@@ -101,6 +101,7 @@
 #include <QMessageBox>
 #include <QMimeData>
 #include <QPainter>
+#include <QPainterPath>
 #include <QPrintDialog>
 #include <QPrinter>
 #include <QPropertyAnimation>

src/plugins/texteditor/texteditoroverlay.cpp

@@ -30,6 +30,7 @@
 #include <QDebug>
 #include <QMap>
 #include <QPainter>
+#include <QPainterPath>
 #include <QTextBlock>
 
 #include <algorithm>