…ying is waiting to perform actions like a token refresh

Removed depricated APIs: `UnityWebRequest.result.isNetworkError` and `UnityWebRequest.result.isHttpError`
Replaced with : `UnityWebRequest.Result.ConnectionError` and  `UnityWebRequest.Result.ProtocolError`

adding back the missing code from commit f5c546d

Added Compilations Conditionals as a means of backwards compatibility.
#164 (comment)

Changed lineEndings from Mac to Windows format

Changes to use RetryCallback to handle token expiration

exceptions. NO_CONTENT is not considered as being an error, and
therefore previous code would try to parse body data even with a
NO_CONTENT being returned. Various backend frameworks use NO_CONTENT as
a way to gracefully indicates that a specific resource is empty (for
instance, if you try to get the list of items in a player's inventory
and the inventory is empty).

Add support for PATCH verb

solution to make network call on main thread

Fix: Handle HTTP NO CONTENT status code (204) to prevent null reference exceptions in HttpBase.cs

Support UPM Package