Make TemplateDoorItem and TemplateDoorBlock Actually Usable

[calmilamsy]

As mentioned in #191, these templates are entirely useless right now, and require you to still do basically everything besides opening and closing the door yourself.

So this fixes that. You can now define a whole new door in five-ish lines of code.

Includes a testmod implementation.

[AITYunivers]

I feel like this breaks the conventions of every block template, no? Block Templates typically don't implement any actual logic.

[calmilamsy]

True, though it's either this or removing the template cause it just... doesn't work well at all in it's current state.

[AITYunivers]

Mod developers should be expected to write their own door templates, just like with every other block. Doors aren't the only block that doesn't work straight out of the box.

[calmilamsy]

And what would that be? I currently don't see anything that wouldn't at a glance.

[mineLdiver]

Custom pressure plates are wonky on server, for example

[calmilamsy]

That sounds like an API issue to me, considering there aren't any hardcoded IDs in there.

[calmilamsy]

A reminder to those who don't have access to the code: You currently would have to override DoorItem's useOnBlock. The only method in the entire class.

Without this, I argue we should remove the entire item template because it has no salvageable code otherwise.

[calmilamsy]

Said method is also ~60 lines long too, including whitespace.