Update three water-type move animations

[etdv-thevoid]

Updates the following three water-type move animations that each have rather lackluster vanilla animations in Gen II:

• Crabhammer
• Waterfall
• Octazooka

Each one now has the simple whirlpool bgeffect applied to simulate the water effects used with these moves in later generations.

Builds upon the work of FIQ and SoupPotato in their series of animation updates. See PR #737