Was looking at this in conjunction with resolving suggestions for #805. The XAML framework uses Windows::System::VirtualKey and Windows::System::VirtualKeyModifiers...is there a reason that Terminal should create their own types here that are now maintaining modifiers and enum values for something that already exists? Retrieving the keybindings with a KeyChord that has it's own values is proving to be challenging using them anywhere in the UI due to different types and not being able to cast them accordingly well.

Originally posted by @timheuer in #748 (comment)