Fix shader warnings

Source/Shaders/Editor/QuadOverdraw.shader

@@ -28,7 +28,7 @@ float4 ToColour(uint v)
 META_PS(true, FEATURE_LEVEL_ES2)
 float4 PS(float4 svPos : SV_POSITION) : SV_Target
 {
-    uint2 quad = svPos.xy * 0.5;
+    uint2 quad = (uint2)(svPos.xy * 0.5);
     uint overdraw = overdrawSRV[quad];
     return ToColour(overdraw);
 }

Source/Shaders/Shadows.shader

@@ -53,7 +53,7 @@ float RayCastScreenSpaceShadow(GBufferData gBufferData, GBufferSample gBuffer, f
     float3 raySize = rayEnd - rayStart;
     float2 rayStepDst = abs(raySize).xy * depthSize;
     float rayStepDstMin = min(rayStepDst.x, rayStepDst.y);
-    float3 rayStepMin = raySize / max(min(maxSteps, rayStepDstMin), 1);
+    float3 rayStepMin = raySize / max(min((float)maxSteps, rayStepDstMin), 1);
     float3 rayStep = raySize / maxSteps;
     float3 ray = rayStart + rayStepMin * (dither * 2 + 1.0f);