Crash on failure, don't report errors

When something went wrong in a handler we used to report errors
and then terminate the process normally. This doesn't work so
well with links which won't detect failure.

Now we still catch the error, but throw another one with more
details on why it happened, including the Req object information
and the stacktrace. Ranch will then print an error message with
all this information.

Because we crash directly, this also means that we will not hog
resources unnecessarily for too long when something bad happens.

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