simplified autosave code per rschamp's comments; made isShowingSaveable and autosaveIntervalSecs props

Remove color rotation while saving

Update scratch-paint to the latest version 

Add download and retry saving to saving error alert.

Instead of setting 100% width on the message, causing inappropriate wrapping of the button text. Removed the nbsp in the Try Again text

Track "project changed" state in Redux

I do not like how the alert component is hyper specialized for two distinct use cases. It would be much better to refactor the alerts so that the alerter can just fill the alert with whatever they want. But I do not feel comfortable making that refactor because I know ben and evelyn have gone back and forth about these alerts.

updated scratch-l10n in package.json

We have alerts for this now.
Resolves #3893

Update scratch-vm to the latest version 

Listen to the new project changed event from the VM and keep track of the state in Redux.  Update it as appropriate.

Known issue is that the project is marked as "changed" immediately after it's loaded. This is due to asynchronous event emitting while the project data is loaded, and needs an update to the VM to fix.

Prevent arrow/space from scrolling the page

Adding RTL padding to reconnect button on alerts.

better padding, margin in device connection modal

Update scratch-vm to the latest version 

Hide entire frame unless the VM has not started

Stop action menu focus stealing keyboard events from the VM

Green flag overlay to start in player mode

Update scratch-render to the latest version 

Update scratch-paint to the latest version 

Update scratch-vm to the latest version