Remove message cap

[dominiklohmann]

This is extracted from #174.

@koekeishiya There is currently a cap of how many bytes yabai will read from the socket, and you are likely exceeding that cap when inlining the script this way.

@dominiklohmann So this should print an error when trying to add the signal and support way longer signals, especially considering the example for acting on window ids from an event=application_launched signal is already too long.

The correct solution here is to simply remove the message cap.