Implements #184 weight colours by normal

Implements only a basic approach to this, more advanced suggestions are found and commonly used in literature.

components/renderers/cpp/include/ftl/cuda/normals.hpp

@@ -10,7 +10,9 @@ namespace cuda {
 
 void normals(ftl::cuda::TextureObject<float4> &output,
         ftl::cuda::TextureObject<float4> &temp,
-        ftl::cuda::TextureObject<float4> &input, cudaStream_t stream);
+        ftl::cuda::TextureObject<float4> &input,
+        const ftl::rgbd::Camera &camera,
+        const float3x3 &pose, cudaStream_t stream);
 
 void normal_visualise(ftl::cuda::TextureObject<float4> &norm,
         ftl::cuda::TextureObject<uchar4> &output,