3.4 copy to 3.5 as base copy
C# core PAM with unit tests

New features: Grant, Audit and Revoke Requests
Fix: Removed encoding for .(period) character
mono specific iOS, Android pre-compile directives
Subscribe fix when no network
Grant and Audit methods for Presence channel

Re-routing of non-200 messages to Error Callback
Utility unit test methods to generate grants and cleanup grants
IIS 3.4 copy to 3.5 as base copy
IIS: Added PAM
C# Core 3.5: Fix on multiplex channel  request

Unit tests fix due to info message routing to Error Callback
IIS 3.5: Updated core file
C# Core 3.5: Error Object
C# Core 3.5: Replaced error - string type to PubnubClientError type

Added user-agent to request
C# Core 3.5: WIP error code mapping
C# Core 3.5: WIP error code mapping
C# Core 3.5: WIP on error object model
C# Core 3.5: WIP to be fixed
C# Core 3.5: Error Object Model
C# Core 3.5: Error Level Filter (WIP)
C# Core 3.5: Error Level Filter
C# Core 3.5: Sleep/Awake simulation feature
IIS: PubNub 3.5 - Copied C# core file to IIS

Also updated error callback related changes