This allows us to show the logs to the user and also send them along with any
bug reports. This is a simple system that just keeps the last entries in memory
and nothing is stored permanently, but that's ok for our use case and can be
changed in the future if the need arises.
This shows the server errors directly in the form, instead of a modal dialog
(which is the default for all the other forms and places that throw the exception)
We can now use a widget to show any errors returned by WgerHttpException. This has
to be added on a form-by-form basis, otherwise, the general error handling shows
the results in a modal dialog
