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

Update scratch-vm to the latest version 

Update scratch-paint to the latest version 

Cloud bugfixes

Add variables to the sensing block menu based on the value in the gar…

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

avoid create/save/error loops

Closes #3789

Fix monitor label for day of week block.

menu bar save messaging; self-dismissing alerts

Add exponential backoff for cloud provider.

Move URL query string handling into an HOC

export remixProject reducer function

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

more font options for creator, besides only "Helvetica Neue"

moved z-index of alerts down around modal, loader levels

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.

Add test for ensuring that cloud connection does not happen just because of a project id change. isShowingWithId must also be true.

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.

Update chromedriver to the latest version 

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.