Availability Attributes and Runtime Availability checks. (#3)

Introduces availability checks to Apple.Core. This comes in two parts: Availability attributes and runtime Availability checks. Attributes are used to decorate C# API calls with availability information including the specific versions of each OS that an API was introduced, deprecated, renamed, or obsoleted. Availability checks allow users to wrap blocks of code which call API that may only be available in certain runtimes. By wrapping these code blocks, users can prevent the wrapped code from being called on unsupported OS versions.

Author: jared-marsau

plug-ins/Apple.Core/Apple.Core_Unity/Assets/Apple.Core/CHANGELOG.md

@@ -1,6 +1,12 @@
 # CHANGELOG
 All notable changes to this project will be documented in this file.
 
+## [1.0.4] - 2023-07-25
+### Added
+- API Availability checking
+- Sample to highlight use of new API availability check feature.
+- API Availability attributes to communicate API availability information to users and attach availability metadata to Apple Unity plug-in C# API
+
 ## [1.0.3] - 2022-12-16
 ### Changed
 - Updated logging in AppleFrameworkUtility

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