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

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

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.

We have alerts for this now.
Resolves #3893

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.

The functionality was all moved to the Controls container, these containers are no longer used

This is needed to make the project page work as expected. In the future, investing in ways of making those accessility features work would be good. But for now, it is broken for everyone because it both sends events to the VM _and_ scrolls the page.

Fixes issue #3269

Expand on the backdrop integration test to make sure this is documented/tested behavior

Add cloud provider APIs for deleting and renaming cloud variables. Remove dataIndex from writeToServer function since it is not used.