Simple Gene Rework(xpath)

This mod does minor tweaks to the effects of mollusc gene and skitter gene to make them more consistent with hunter gene. The original discussion about this: https://github.com/Regalis11/Barotrauma/discussions/11647

Mollusc: Receiving physical damage makes the subject gain a 12.5%~37.5% boost to physical damage resistance. Skitter: Receiving physical damage makes the subject gain a 12.5%~37.5% boost to walking speed and 25%~75% boost to swimming speed.

This mod is realized with partial override.

这个mod修改了软体动物、飞掠者基因的效果，使其与猎杀者基因具有更好的一致性。 关于这个修改的讨论串（英文）：https://github.com/Regalis11/Barotrauma/discussions/11647

软体动物：该角色受到物理伤害时，物理伤害抗性提升12.5%~37.5%。 飞掠者：该角色受到物理伤害时，行走速度提升12.5%~37.5%，游泳速度提升25%~75%。