refactor: move loadHidpiIcon from ActionManager to ToolButton.

setting loadHidpiIcon in ToolButton is better than ActionManager.
ToolButton has less code and its aim also include loading icon.

app/toolbutton.cpp

@@ -4,9 +4,10 @@
 
 #include "toolbutton.h"
 
-#include "actionmanager.h"
 #include "opacityhelper.h"
 
+#include <QSvgRenderer>
+#include <QGuiApplication>
 #include <QPainter>
 #include <QGraphicsOpacityEffect>
 #include <QPropertyAnimation>
@@ -29,7 +30,18 @@ ToolButton::ToolButton(bool hoverColor, QWidget *parent)
 
 void ToolButton::setIconResourcePath(const QString &iconp)
 {
-    this->setIcon(ActionManager::loadHidpiIcon(iconp, this->iconSize()));
+    this->setIcon(ToolButton::loadHidpiIcon(iconp, this->iconSize()));
+}
+
+QIcon ToolButton::loadHidpiIcon(const QString &resp, QSize sz)
+{
+    QSvgRenderer r(resp);
+    QPixmap pm = QPixmap(sz * qApp->devicePixelRatio());
+    pm.fill(Qt::transparent);
+    QPainter p(&pm);
+    r.render(&p);
+    pm.setDevicePixelRatio(qApp->devicePixelRatio());
+    return QIcon(pm);
 }
 
 void ToolButton::setOpacity(qreal opacity, bool animated)