[Xedra Evolved] Extend hedge magic research system, part 1

[Standing-Storm]

Summary

Mods "[Xedra Evolved] Extend hedge magic research system, part 1"

Purpose of change

Now that the hedge magic research system is in, time to extend it back to older occult tomes.

Describe the solution

Extend the hedge magic research system. The next PR will finish the extension.

Boann's quest reward has been left out--the idea is that if you find the ritual in an old human-written tome, you have to decipher it, but the ritual Boann gives you is written clearly and succinctly, making research unnecessary.

Describe alternatives you've considered

Testing

Books can be researched, progress is saved, and stopping research on one book and then starting it on another book does not cause any problems.

Additional context

Once this is all done I can put in the hedge magic hobby basements and their scribbled notes.

At the moment the timescale is relatively low. If CDDA has its average expected game length increased I can start putting in "8 weeks to study and comprehend" Call of Cthulhu-style tomes.