Check if standard_io can handle Unicode, and if so add the 't'
modifier to format strings.

Make error_logger_tty_h insert node information for nonlocal messages before
the message itself instead of after, both for readability and so as not to
change the line termination property at the end of the message.

Add the possibility to truncate big messages to avoid running out
of memory.

Refactor, simplify, and modernize the code to facilitate future
improvements in the following commits.

A long time ago, errors from the emulator itself was sent as
messages that would end up in the handle_info/2 function.
Those clauses in handle_info/2 can be removed.

The code for handling events tagged 'info' instead of 'info_msg'
can also be taken out.