Change how we're handling invalid configurations

Since our configuration format is a bit more complex than php's one,
we have a `sp.allow_broken_configuration` parameter (`false` by default),
that you can set to `true` if you want PHP to carry on if your Snuffleupagus'
configuration contains syntax errors. You'll still get a big scary message in
your logs of course. We do **not** recommend to use it of course, but sometimes
it might be useful to be able to "debug in production" without breaking your
website.

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