Attempt to add new spells and skills.

There are many new special abilities in NHF; I also added them to my mod, you can take a look. Here, special abilities aren't quite appropriate because, for example, there are limitations on the number of abilities for creatures and artifacts, and that's what we want to expand. However, these types of special abilities don't have that kind of mechanic, and we don't need to expand anything to add new ones; we just need to write them using scripts (and there are already limitations in the scripts, but that's a different story).