Update the tests to work with oragono
Merge remote-tracking branch 'linkmauve/die-gc1.0-die'
And modify the tests to work, by adding the <x/> node in all join presences
Split all the e2e tests in their own files
Some duplication is avoided, but most importantly: it’s much much cleaner,
easier to find, functions have been cleaned up (functools.partial usages are
now hidden), etc.