Metamod 1461+ removed SourceHook (plugin API 17 -> 18), so the MM plugin was rejected
and RayTraceImpl crashed on a null CRayTraceInterface002. Replace the two SourceHook
hooks with KHook, build against Metamod's bundled KHook headers, include ray.h
explicitly for the updated hl2sdk, and disambiguate TraceOptions/TraceResult from
CounterStrikeSharp 1.0.375's new types of the same name.