Add Watermelon's Unique Grab/Throw

[Aegistus]

https://docs.google.com/document/d/1YPB1VO8KsfIz_HHzzeWehDfYqCgph39yyKL6Chr-bSc/edit?usp=sharing From the design doc:

Unique Grab/Throw: Trait:

• Further Grab range
• Knocks away all nearby foes upon landing
• Higher Damage Animation:
• Jumps up off screen in the grab pose, then quickly falls back to the group, with the held foe upside down, who goes flying in intended throw direction upon impact

[Justin1L8]

task combined into #229