[Combat] Improve (lua's) mob spell choosing logic

[Xaver-DaRed]

I affirm:

• I understand that if I do not agree to the following points by completing the checkboxes my PR will be ignored.
• I understand I should leave resolving conversations to the LandSandBoat team so that reviewers won't miss what was said.
• I have read and understood the Contributing Guide and the Code of Conduct.
• I have tested my code and the things my code has changed since the last commit in the PR and will test after any later commits.

What does this pull request do?

• Spell choosing:
  • Adds a table of default values to most spells, to ease spell list definitions.
  • Adds functionality to override almost anything a mob evaluates to cast an spell. <- The important stuff.
  • (In process) Converts current usage to new system.
• Other stuff I came across:
  • Adds functionality for -storm II spells.
  • Adds several mob only spell entries.
  • Fixes some spell parameters.
  • Improves Addle and Addle II spell calculations to make them match retail.

Steps to test these changes

1. Ask nicely for some1 to test it once it's finished.
2. ?
3. Profit.