Feature: Reset Training Button

[helblazer811]

Summary: Add a button to the left of the run training button that resets the model.

Styling:

• Have a button like this.
• Set the height of the button to the same height as the epochs counter text.
• Put it to the left of the run training button.

State Changes:

• The button should set epochs to zero.
• When training, resetting should stop training after it sets it to zero.
• The run training button should resume training, rather than resetting after the button.
• If a pretrained model is selected, the button should switch to non-pretrained and reset that model to zero-epochs (if there is one).

Implementation Details:

• Add a reset_training function to the state_mangagement.ts file.
• Add a ResetTrainingButton.svelte component, that on-click runs the reset_training function