Core: Introduce a IOptionsPage::setCategoryIconPath

Less noise on the user side.

Change-Id: I34dea09e8a3c8639f5a7db89b22f8b825b946395
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/coreplugin/dialogs/ioptionspage.cpp

@@ -37,6 +37,8 @@
 #include <QLabel>
 #include <QPushButton>
 
+using namespace Utils;
+
 /*!
     \class Core::IOptionsPage
     \mainclass
@@ -144,6 +146,11 @@ void Core::IOptionsPage::finish()
     }
 }
 
+void Core::IOptionsPage::setCategoryIconPath(const QString &categoryIconPath)
+{
+    m_categoryIcon = Icon({{categoryIconPath, Theme::PanelTextColorDark}}, Icon::Tint);
+}
+
 /*!
     \fn void IOptionsPage::setId(Id id)