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.

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

Set VM's cloud provider to null when disconnecting from the cloud server. Add unit test for disconnecting on unmount.

This will work better if there are other query string options that need to be handled later. It also handles the distinction between ‘all’ and the other tutorials better.

Fix issue where regular cloud variable messages were throwing uncaught Json parse errors because of a newline being at the end of the message. Add test that fails without the bugfix.

Fix cloud connection logic so that cloud connections are made and cleared out appropriately. This fixes a bug where we were making two cloud connections when creating a new project and not clearing out previous connections when switching between editor and preview/player mode.

Uses randomized duration between [0, 2^k-1] where k is the connection attempt number, maxed out at 5.

I had to rework the tests quite a bit to make this easy to test, to work around the timeouts and the randomization.