[feature] Fontscaling in Shell.xaml for better readability on high Resolution Screens.

[ZuiMelanieForno]

Hi. I´m so confident this is a nice MVVM Toolkit. Nice work.

Back to the Topic: Feature request is simple.

It would be nice to have a Scaling option. I am getting old and my 4k Screen is nice to have, but to have to read in the UWP Sample app is really hard. I added this to the Shell.xaml in the muxc:NavigationViewItems at the end.

<muxc:NavigationViewItemSeparator />
<muxc:NavigationViewItem>
    <StackPanel Orientation="Horizontal">
        <TextBlock
            Margin="0,0,7,0"
            VerticalAlignment="Center"
            Text="FontSize" />
        <muxc:NumberBox
            HorizontalAlignment="Left"
            Maximum="72.0"
            Minimum="8.0"
            PlaceholderText=""
            Value="{x:Bind FontSize, FallbackValue=14.0, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />
        <TextBlock
            Margin="7,0,0,0"
            VerticalAlignment="Center"
            FontStyle="Italic"
            Text="from 8 to 72 - decimal" />
    </StackPanel>
</muxc:NavigationViewItem>     

I would made a change in the Repo and maybe a MergeRequest, but I am new to Git. I dont´wnt to mess up things. :)

Thank You in advance if FontScaling could be implemented.

Greetings from Hamburg, Germany. Zui.