Style: Kestrel cleanup

[glennc]

• Members should have appropriate visibility
• One class per file
• Nested classes or enums at bottom of file
• Constructors come before properties
• Remove all commented code
• Sort namespace
• move declarations to the top of the file
• x is a bad variable name

[glennc]

@lodejard Given that all these are ticked does that mean you are done?

[DamianEdwards]

@lodejard ping