Sea Rework V2

Snake reworked to have fast moving forward torpedo.
Given tactical AI and new values to compensate. Overall has a similar role.

Hunter tweaked to have burst-fire effect, but similar behavior. Given slight impact to help slow down attacking raiders and repel floating amphibs.

Claymore buffed slightly in many ways. Hopefully a bit less suicidal.

Dagger sonar adjusted to actually be correctly nerfed this time.

Duck received a major nerf that makes them consistent across land and sea- they now block eachother's fire underwater.

Other minor balance tweaks:
Skeeter slightly faster.
Urchin has slightly more sonar range.
Crusader depth charges nerfed for tracking slightly.
Typhoon gained slight damage increase.