Cleanup C# Markup

[VincentH-Net]

• Separate UI Markup from UI Logic with partial classes
• Reformat whitespace to markup C# style and use consistent layout line convention (see C# Markup spec description)
• Reduce noise - vm instead of full viewmodel type name
• Use a few more helpers that are shorter (Star) and communicate intent more clearly (ColumSpan(All<Column>()) instead of ColumSpan(2))

[brminnick]

Thanks Vincent!