* For iOS 15.5, refactor how MGL Expressions are defined. Fix for "NSExpression function is forbidden" #331
* Convert CI Scheme to TestPlan. Add CI-Expressions TestPlan (which skips tests unrelated to `NSExpression`)
* Update Swift & Objective-C sample Code for MGL Expressions. Use these patterns for fixing unit tests.
* Update Swift sample code & documentation for MGL expressions. Update API docs (.h) & online docs (HTML) with: `make darwin-style-code && make idocument`
* Refresh developer documentation for: build dependencies, running unit tests from the command line, and logging in C++.
* Mark certain unit tests as "Expected Failures": Awaiting unit test refactoring for https://github.com/maplibre/maplibre-gl-native/issues/331
* Update to latest Xcode & iOS SDK. Update GitHub Action Runner Images from https://github.com/actions/runner-images
* For iOS 15.5, add "Expected Failure" for tests
* Skip failing test unrelated to NSExpressions
* Convert macOS project to use Test Plans
* Exclude previously failing Offline Storage test
* Refactor MGL Match expressions for macOS & iOS 15.5
* Refactor Unit Tests so that "Excluded Failures" work for both macOS 12 & iOS 15.5
* Refresh documentation on how to test for macOS from the command line
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