Add custom display to ParserException in order to handle newlines correctly

[ChrisRackauckas]

See the discussion in SciML/BaseModelica.jl#48

[oxinabox]

This looks reasonable.
I think it should ave a test that calls repr and checks there is no literal \n in output.

Also we need to move this repo.
While I have merge rights here i do not have permissions to move it.
cc @andrewcooke

Also we need to fix CI