Reorganize C# snippets based on API name

[gewarren]

Organize C# snippets into subfolders based on namespace and type.

Folders to organize:

• samples/snippets/csharp/api
• samples/snippets/csharp/VS_Snippets_CLR
• samples/snippets/csharp/VS_Snippets_CLR_Classic
• samples/snippets/csharp/VS_Snippets_CLR_System
• samples/snippets/csharp/VS_Snippets_CodeAnalysis
• samples/snippets/csharp/VS_Snippets_Data
• samples/snippets/csharp/VS_Snippets_Misc
• samples/snippets/csharp/VS_Snippets_Remoting
• samples/snippets/csharp/VS_Snippets_VBCSharp

Consider for later:

• samples/snippets/csharp/VS_Snippets_WinForms
• samples/snippets/csharp/VS_Snippets_WPF