Add support for ModifierFlags on PointerGestureRecognizer (PointerEventArgs)

[PureWeen]

Description

Add the ModifierFlags on the PointerEventArgs for all PointerGestureRecognizer events.

Public API Changes

[Flags]
public enum KeyboardAcceleratorModifiers
{
    None,
    AlphaShift, // iOS only?
    Shift, // iOS and windows
    Control, // iOS and Windows
    Alternate, // iOS only?
    Command, // iOS
    Windows, // Windows only
    NumericPad, // iOS only
    Menu // Windows Only   
}

public class PointerEventArgs
{
     public IList<KeyboardAcceleratorModifiers> ModifierKeys { get; }
}

Intended Use-Case

Support the ability to add behavior for scenarios like "Shift and Left Click"

Additional Research

Do we need to add "secondary/primary" information as well?

Alternative solution for now

• we just add the platform args to PointerEventArgs then users can just tap into these themselves.

[ghost]

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