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Free locks after timeouts and other uncatchable errors

Catch callback exceptions to avoid deadlock

If an event callback fatals or times out, it can deadlock. By catching the fatal (PHP 7+), deadlock is avoided.

Fixes #105
Fixes #117

See https://hub.docker.com/r/_/mysql/

https://packages.debian.org/search?suite=jessie&mode=filename&searchon=contents&keywords=mysqladmin

Just a waste of resources, and next go around will capture these.

Will allow for more failure logging, as current logging isn't particularly relevant beyond development