Split bomb and fish collision check

[ForNeVeR]

See the code near this line:

O21/O21.Game/Engine/Entities.fs

Line 79 in 1b66ffb

countCollision b enemies * GameRules.GiveScoresForBomb // TODO: Split bomb and fish collision check

Currently, we have common constant for score bonus for both bombs (passive enemies) and fish (active enemies). Probably we should split that into two separate checks, and thus two different collision types (or the collision object should bear the enemy kind as well).