Workaround IL2CPP missing support for Console.CancelKeyPress

[jvyden]

This gets the IL2CPP renderer a little further into initialization.

When setting up a queue, Interprocess will setup an event handler with the console's ^C handler to shutdown cleanly when the process is exited via the console.

This ends up calling a method in Mono named WindowsConsole::DoWindowsConsoleCancelEvent which is missing a MonoPInvokeCallback attribute, which is required for managed methods under IL2CPP. This ends up throwing a NotSupportedException:

Failed to connect to the controller:
System.NotSupportedException: To marshal a managed method, please add an attribute named 'MonoPInvokeCallback' to the method definition. The method we're attempting to marshal is: System.Console+WindowsConsole::DoWindowsConsoleCancelEvent
  at System.Console+WindowsConsole.SetConsoleCtrlHandler (System.Console+WindowsConsole+WindowsCancelHandler handler, System.Boolean addHandler) [0x00000] in <00000000000000000000000000000000>:0 
  at System.Console.add_CancelKeyPress (System.ConsoleCancelEventHandler value) [0x00000] in <00000000000000000000000000000000>:0 
  at Cloudtoid.Interprocess.Queue..ctor (Cloudtoid.Interprocess.QueueOptions options, Microsoft.Extensions.Logging.ILoggerFactory loggerFactory) [0x00000] in <00000000000000000000000000000000>:0 
  at Cloudtoid.Interprocess.Publisher..ctor (Cloudtoid.Interprocess.QueueOptions options, Microsoft.Extensions.Logging.ILoggerFactory loggerFactory) [0x00000] in <00000000000000000000000000000000>:0 
  at Cloudtoid.Interprocess.QueueFactory.CreatePublisher (Cloudtoid.Interprocess.QueueOptions options) [0x00000] in <00000000000000000000000000000000>:0 
  at Renderite.Shared.MessagingManager.Connect (System.String queueName, System.Boolean isAuthority, System.Int64 capacity) [0x00000] in <00000000000000000000000000000000>:0 
  at Renderite.Unity.RenderingManager.Awake () [0x00000] in <00000000000000000000000000000000>:0 

We can't modify Mono here easily, so to fix, just catch and ignore that particular exception.

Related to Yellow-Dog-Man/Renderite.Unity.Renderer#2

[Frooxius]

Huh. I didn't actually know the library is hooking into this in the first place.

This looks ok! Good on making the Exception type scoped too!

Thank you!