Application.Driver.SendKeys should be retired

[tznind]

Is your feature request related to a problem? Please describe.

This method is problematic for 2 reasons:

• It assumes that all drivers operate on char and/or ConsoleKey
• It requires/assumes that the user knows what combination of keyChar and ConsoleKey describe a given key press

The actual raw inputs are:

Driver	Class
Win	InputRecord (and KeyEventRecord)
Net	ConsoleKeyInfo

Furthermore this method is not implemented in v2 drivers. See ConsoleDriverFacade:

public void SendKeys (char keyChar, ConsoleKey key, bool shift, bool alt, bool ctrl)
{
    // TODO: implement
}

Finally if we were to have a shared implementation of spawning keystrokes - then it should be the class that is used within Terminal.Gui itself to represent key presses in driver agnostic way, specifically:

 class Key : EventArgs, IEquatable<Key>

Describe the solution you'd like
Mark obsolete or internal or remove

Describe alternatives you've considered
or internal or remove

Additional context
Add any other context or screenshots about the feature request here.

[tig]

Yes. Please!