CFluidPlaneCPU: Initialize m_cachedDoubleLightmapBlend and m_cachedAdditive
CFluidPlaneCPU: Initialize m_cachedDoubleLightmapBlend and m_cachedAdditive

Provides a deterministic initial state upon construction.

AxioDL/PathShagged,AxioDL/PathShagged,AxioDL/PathShagged