Expose error callbacks, prevent always setting header #908
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This allows debugging our local app, without these errors appear in the header.
it also allows us to send the errors to rollbar instead of informing the user.
Which is useful for development, but kinda bad for production systems.
I made the setHeaderMessage and resetHeaderMessage functions public so the user can emulate default behavior with the callbacks.
By default, it should keep doing whatever it was doing before.
Also fixes webpack build script on nixos.