Added Crash Dumps and automatic reporting

This branch adds the old crash dumps in a way that can be processed by programs easily, give more information to developers and removes personal information.

It also adds automatic reporting into the [Crash Archive](http://crash.pocketmine.net/), that can be turned off via a *pocketmine.yml* setting. The link given can be used as a reference instead of pasting the full report when submitting a crash, for PocketMine-MP and plugin developers.