Änderungen

Summary

1. add guard ext funcs (details)
2. add LinkedList#getRandomElement (details)

Commit 1e60540cd76f09bce1d6bf28c31e099b3fc3f3c4 by frotty add guard ext funcs
	wurst/_handles/Unit.wurst (diff)
Commit 183eba7452548609b05e8b59b43b653e32d0a378 by frotty add LinkedList#getRandomElement
	wurst/data/LinkedList.wurst (diff)