RF: Change `TextureHandleLinear` to accept a `std::vector` rather than a device vector

Paul McCarthyrequested to merge
rf/texturehandle-stdvector into master

All uses of the TextureHandleLinear convert a std::vector to a thrust::device_vector solely to initialise the TextureHandlerLinear, so this logic may as well be pushed down into the TextureHandleLinear class.

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