Use point size when defining font size

Avoid pixel size for easier config across multiple environments
Set default font size for plots to 10 points
Use Small instead of XSmall for default font in plot
Remove pt postfix to indicate point size

ApplicationLibCode/UserInterface/RiuTextContentFrame.cpp

@@ -38,7 +38,7 @@ RiuTextContentFrame::RiuTextContentFrame( QWidget* parent, const QString& title,
     : RiuAbstractOverlayContentFrame( parent )
     , m_title( title )
     , m_text( text )
-    , m_fontPixelSize( fontPixelSize )
+    , m_fontSize( fontPixelSize )
 {
     setSizePolicy( QSizePolicy::Preferred, QSizePolicy::Maximum );
 
@@ -170,10 +170,10 @@ void RiuTextContentFrame::layoutInfo( LayoutInfo* layout ) const
 //--------------------------------------------------------------------------------------------------
 void RiuTextContentFrame::updateFontSize()
 {
-    if ( m_fontPixelSize != -1 )
+    if ( m_fontSize != -1 )
     {
         QFont font = this->font();
-        font.setPixelSize( m_fontPixelSize );
+        font.setPointSize( m_fontSize );
         setFont( font );
     }
     else