Updated Gorons - adults now much tougher

- Attribute values now set correctly for child versions and update when
entity reaches adulthood
- Increased damage: adults deal 8 damage instead of 2; children still
deal 2 damage.
- Increased armor: adults now have 10 armor instead of 6; children have
4 instead of 0.
- Increased health of adults from 60 to 100, and reduced children's to
40
- Children now slightly faster and much less resistant to knockback than
adults