A few modifications were made while making this test:
- Change the "defaultMin/Max" to just be called "min/max", and pass the state through to make the inputs a controlled component. It is best to make form elements controlled since it makes it more clear how data flows.
- Force the passed in data to always be of type `number`, and transform it in the constructor to always be of type `string`, and change the onOk to transform it back to a number. With inputs, it is best to be very explicit about data types, and make it clear where you are using strings and where you are using numbers.
- Do not reset the state to `0` when the field is blank, that makes typing into it very hard (only applies after making it a controlled field)
- Use consistent booleans. Since the VM uses `isDiscrete`, change it so we do not use any opposite flags (like `decimal`) for clarity.

Writing tests for this really helped me understand the behavior. If you read through the test descriptions and see anything you did not intend, let me know.

Update scratch-vm to the latest version 

Fix loading single frame gifs by removing onDone in favor of indices

Because the `onFrame` callback could do async work, it was possible for onDone to try to submit the costumes before the onFrame had produced any. This was subject to browsers different timing treatments of setTimeout vs. promise resolution. This makes the gif-decoder use the same style of progress API as the file uploader

Update scratch-l10n to the latest version 

Show an "Importing..." alert during file import

Put the ask blocks text input above the monitors on the stage.

chore(package): update scratch-vm to version 0.2.0-prerelease.2019021…

chore(package): update scratch-render to version 0.1.0-prerelease.201…

Closes #4548

Closes #4544

chore(package): update scratch-l10n to version 3.1.20190213142844

Update scratch-vm to the latest version 

Support isDiscrete sliders

Closes #4536

Prompt before file upload replaces project

Update scratch-vm to the latest version 

chore(package): update scratch-blocks to version 0.1.0-prerelease.154…

Closes #4540

Update scratch-vm to the latest version 

Delete Preview Modal