Remove normalisation of response logic from Lily\Adapter\HTTP

Normalising response logic in Lily\Adapter\HTTP creates problems when
it comes to middleware. If a handler doesn't always return an
associative array, we get problems adapting the response as we have to
check if it is a string, numeric array or associative array. For now
there will no longer be short forms of responses provided by this class.
Add normalisation of route handler responses in Lily\Application\RoutedApplication

Without Lily\Adapter\HTTP normalising responses the sugar was also lost
from Lily\Application\RoutedApplication. This was a shame since this
class is mainly to provide modern web application tools for those who
choose to use Lily. I'm talking routing here. However also other tools
for completing these jobs don't require the verbosity of an associative
array for responses. Therefore it would be nice if RoutedApplication
also did not require this. Boom.