Adding macOS Compatibility (via AppKit)

[martindufort]

I have forked this repo in order to add macOS compatibility and add it to one of our project.

In order to do so, without a huge amount of #if os(macOS) layered everywhere, I decided to leverage the compatibility framework UXKit: https://github.com/ZeeZide/UXKit

Are you interested in a PR that would support macOS compatibility or you intend on keeping this compatible with iOS macCatalyst only.

This will also imply that your package will have a dependency on UXKit to be compiled without errors.
Thanks

[Awesomeplayer165]

I think it's fine to have that dependency as long as it builds on all platforms fine. Open!

[martindufort]

Excellent. I can also submit a fix for issue #25 which I have resolved.
I'm also working on having the PillView always centered within the window to resolve issue #24

[martindufort]

Little update on this PR.

I'm waiting for ZeeZide/UXKit#3 to be approved so I can submit my changes here (since there is now a dependency).

Not sure what the timeline is for the repo owner to action this.
Will let you know how it goes...

UPDATED
Decided to use the equivalent and simpler NSUI package to provide AppKit compatibility.

[Awesomeplayer165]

No problem!