[WPF] Add markup support to RichTextViewBackend
[WPF] Add markup support to RichTextViewBackend

cra0zy/xwt,TheBrainTech/xwt,akrisiun/xwt,hamekoz/xwt,mono/xwt,lytico/xwt,hwthomas/xwt,residuum/xwt,antmicro/xwt