Fine Tune Training

[BryonLewis]

Will allow users to choose a model to allow for fine-tune training.
resolves #1375

• Logs the model files that are available after downloading the add-ons for the web version
• The endpoint for training configs has been updated to show the models as well as the configs.

TODO:

• Update front-end to utilize modified Training configs
• Add optional checkbox on front-end to fine-tune model
• Update the endpoint to run training so that a model can be passed in as well
• Add in argument to the training task in celery to utilize new input

Desktop Version

• Find a way to search and find available models in the desktop version
• Update the interface to show the models that can be fine tuned
• Update the call to running training to add in the new optional fine-tune training model.

[BryonLewis]

Everything is templated out for the fine-tune training just need some executables (docker container and VIAME desktop) to test with.

[BryonLewis]

Tested the following:

• Web version will display the --init-weights command when configured in the UI.
• Desktop version does the same and displays --init-weights.

Possibly Todo:

• Better arrangement of values (like dividing into system models and user models)
• Styling for the training menu so it expands better, possibility having a max height and scrolling.

[naglepuff]

Full disclosure - I did not get a chance to do any functional testing of this branch, but I did give the code a look, and found some suggestions.