Changes to fix Catalyst compatibility

[CAPIStkidd]

Issue Link 🔗

#4233

Goals ⚽

Fixes compatibility with Catalyst

Implementation Details 🚧

Essentially, in the "Platform+" files, attempts to alias types to their AppKit equivalents for regular macOS apps works file, but fails in Catalyst apps because while those are Mac apps, Catalyst needs UIKit for certain things.

Basically I changed this line in four files

#if canImport(AppKit)

to

#if canImport(AppKit) && !targetEnvironment(macCatalyst)

Which causes the macro to skip over this on Catalyst apps.

Testing Details 🔍

No changes to unit testing performed, though I have successfully tried my fork in a Catalyst app, and the changes above have no effect on the macOS demo app in the project.

[codecov-io]

Codecov Report

Merging #4254 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #4254   +/-   ##
======================================
  Coverage    41.5%   41.5%           
======================================
  Files         123     123           
  Lines       14045   14045           
======================================
  Hits         5829    5829           
  Misses       8216    8216

Impacted Files	Coverage Δ
Source/Charts/Utils/Platform+Color.swift	62.5% <ø> (ø)	⬆️
Source/Charts/Utils/Platform+Touch Handling.swift	0% <ø> (ø)	⬆️
Source/Charts/Utils/Platform+Gestures.swift	11.11% <ø> (ø)	⬆️
Source/Charts/Utils/Platform+Graphics.swift	37.5% <ø> (ø)	⬆️

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