Create Float16 Versions of models in known sizes.

[DennisSmolek]

One if the reasons we dont use pre-loaded models is the unknown size of inputs as well as the variety of properties to create the model.

However, with Tiling, the size of the model is standard. So it would be easy to create standard models at standard sizes, starting with the default tile of 256 X 256.

Doing a 256_cAux and 256 model in float16 would be significantly faster than the float32 that we use in the browser and wouldn't require the loading of weights at runtime.
It also makes models 50% the size and sometimes operate 4X faster.