Revert "Temporarily use PNG icons over SVG"

This reverts commit 45116a193b67a197eb749b826de214180f8e699d.

The SVG image format plugin is now packaged within Slicer,
no need to use a PNG alternative solution.

Libs/Widgets/Plugins/ctkSearchBoxPlugin.cpp

@@ -47,7 +47,7 @@ QString ctkSearchBoxPlugin::domXml() const
 // --------------------------------------------------------------------------
 QIcon ctkSearchBoxPlugin::icon() const
 {
-  return QIcon(":/Icons/search.png");
+  return QIcon(":/Icons/search.svg");
 }
 
 //-----------------------------------------------------------------------------

Libs/Widgets/Resources/ctkWidgets.qrc

@@ -6,8 +6,6 @@
     <file>Icons/expand-down.png</file>
     <file>Icons/expand-up.png</file>
     <file>Icons/search.svg</file>
-    <file>Icons/search.png</file>
     <file>Icons/clear.svg</file>
-    <file>Icons/clear.png</file>
   </qresource>
 </RCC>

Libs/Widgets/ctkMenuComboBox.cpp

@@ -90,7 +90,7 @@ void ctkMenuComboBoxPrivate::init()
   // SearchButton
   this->SearchButton = new QToolButton();
   this->SearchButton->setText(q->tr("Search"));
-  this->SearchButton->setIcon(QIcon(":/Icons/search.png"));
+  this->SearchButton->setIcon(QIcon(":/Icons/search.svg"));
   this->SearchButton->setCheckable(true);
   this->SearchButton->setAutoRaise(true);
   layout->addWidget(this->SearchButton);

Libs/Widgets/ctkSearchBox.cpp

@@ -61,8 +61,8 @@ public:
 ctkSearchBoxPrivate::ctkSearchBoxPrivate(ctkSearchBox &object)
   : q_ptr(&object)
 {
-  this->clearIcon = QIcon(":Icons/clear.png");
-  this->searchIcon = QIcon(":Icons/search.png");
+  this->clearIcon = QIcon(":Icons/clear.svg");
+  this->searchIcon = QIcon(":Icons/search.svg");
   this->clearIconMode = QIcon::Disabled;
   this->showSearchIcon = false;
   this->alwaysShowClearIcon = false;