Identify what conversions are possible

If a person selects a keras file, show them what conversions we'll do.

Later when they upload a .caffe or whatever, we'll show options.

Review the repository's model-conversion handling and identify how a selected Keras file is represented. Define the supported conversion options that should be shown for Keras files, and consider how the same behavior would extend to formats such as Caffe; done means users can see applicable conversions before uploading.

Written by the indexing model from the issue text.