Updated shaders for new API

Packages/com.verasl.water-system/Shaders/WaterCommon.hlsl

 	half fresnelTerm = CalculateFresnelTerm(lerp(IN.normal, half3(0, 1, 0), 0.5), IN.viewDir.xyz);
 
 	// Shadows
-	half shadow = DirectionalLightRealtimeShadow(TransformWorldToShadowCoord(IN.posWS));
+	half shadow = MainLightRealtimeShadow(TransformWorldToShadowCoord(IN.posWS));
-	Light mainLight = GetDirectionalLight();
+	Light mainLight = GetMainLight();
 	half3 ambient = SampleSHPixel(IN.lightmapUVOrVertexSH, IN.normal) * (mainLight.color * mainLight.distanceAttenuation) * 0.5;
 
 	// Reflections

Packages/com.verasl.water-system/Shaders/WaterLighting.hlsl

 //specular
 half3 Highlights(half3 positionWS, half roughness, half3 normalWS, half3 viewDirectionWS)
 {
-    Light mainLight = GetDirectionalLight();
+    Light mainLight = GetMainLight();
 
     half roughness2 = roughness * roughness;
     half3 halfDir = SafeNormalize(mainLight.direction + viewDirectionWS);