DolphinQt: cache icons instead of single pixmaps

Fixes dynamically changing dpi scaling.
Load resources from svg if possible.
Currently svg support is not in Qt build in Externals,
and image files need to be added later.

Source/Core/DolphinQt/Debugger/MemoryViewWidget.cpp

@@ -583,7 +583,7 @@ void MemoryViewWidget::UpdateBreakpointTags()
     {
       m_table->item(i, 0)->setData(
           Qt::DecorationRole,
-          Resources::GetScaledThemeIcon("debugger_breakpoint")
+          Resources::GetThemeIcon("debugger_breakpoint")
               .pixmap(QSize(m_table->rowHeight(0) - 3, m_table->rowHeight(0) - 3)));
     }
     else