This removes the `FIRMessaging_FAIL` macro which was using `__builtin_trap()`, and replaced with `NSAssert` calls. These `NSAssert` calls may not get called in release builds, and so we also log them with FIRLogger error messages.
The RMQ database open error result code is now parsed and included in the error message to help us identify causes for #199 .
This should address the issue filed at: https://github.com/firebase/quickstart-ios/issues/242, where a topic name containing a `%` character was failing. It turns out that the topic name was never being url-encoded.
This seems to be a holdover from some old code, and it's not being used anywhere in the component. Plus it's better not to be saving anything in `[NSUserDefaults standardUserDefaults]` as that is the developer/app's domain.
Also renamed the messaging code while I was in there to be something meaningful ("000" → "PrintLibraryVersion").
Maybe it was already swizzled, or some other issue. Either way, it would be good to log this error, as it might help us / developers diagnose an issue.
Riz