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.
this sounds scary... not good for raider imo, good for arty