Turtle Shell Improvements

I felt like Turtle Shells were surprisingly lackluster. So I've made some changes-

• The Turtle Shells durability is not 732.
• Armour points have been raised to 3 from 2.
• Turtle Shells now provide Armour Resistance.
• The Water Breathing granted now lasts for 30 seconds instead of 10.
• The Turtle Shell is easier to enchant.
• When a Turtle Shell is enchanted with Respiration, the effect will be stronger than that of regular armour sets. Instead of adding 3 Oxygen points to the player, Respiration 3 adds 4.35 Oxygen points on a Turtle Shell.

I primarily created this for personal use on servers with friends, but if anybody else wants these changes for their own, feel free to use it!