fix: add create to skill and remove contains check from hookTree

[LordMidas]

The contains check will cause leaf classes which do not have create defined to not be properly hooked by our hookTree. The solution to this is to add create directly to the base skill class and then hookTree it.

[Suor]

Will break mods that old style loop parent up until there is no create, theoretically.

Practically the Spin skill from a bug does have create().