Add automatic saving throw bonuses for core rulebook races

[orffen]

Read actor.race.value.toLowerCase() and automatically add if it matches:

dwarf save at +4 vs. Death Ray or Poison, Magic Wands, Paralysis or Petrify, and Spells, and at +3 vs. Dragon Breath.

elf save at +1 vs. Paralysis or Petrify, and +2 vs. Magic Wands and Spells.

halfling save at +4 vs. Death Ray or Poison, Magic Wands, Paralysis or Petrify, and Spells, and at +3 vs. Dragon Breath.