External arguments validation

[bogu9821]

Adding arguments validation rules might be useful and can remove a lot of ifs in the externals code. e.g. we can eliminate checks if pointer is nullptr.
It must also allow you to make custom rules because sometimes you want to have nullpointers or some any different unvalid states.

[bogu9821]

Example: automatic nullpointer checks

Transform code like this

void Npc_DoTakeItem(oCNpc* t_npc, oCItem* t_item)
{
	if (!t_npc || !t_item)
	{
		return;
	}

	t_npc->DoTakeVob(t_item);
}

Into

void Npc_DoTakeItem(oCNpc* t_npc, oCItem* t_item)
{
	t_npc->DoTakeVob(t_item);
}

[bogu9821]

I also need to add checks of the instance types, because daedalus does not distinguish them.
e.g. item instance can be passed to npc argument and this can lead to a crash.