Merge pull request #4295 from LLK/revert-4289-greenkeeper/scratch-render-0.1.0-prerelease.20190108175224

Revert "Update scratch-render to the latest version "

Check for minimum versions of recommended browsers

Update scratch-audio to the latest version 

Update scratch-render to the latest version 

Save project state before storing assets instead of after.

Update scratch-vm to the latest version 

Update scratch-render to the latest version 

Update scratch-vm to the latest version 

Update scratch-vm to the latest version 

Fix sound editor button spacing

Make the sprite drop area from the backpack highlight and large

Fixes useability issue where the drop area was too small, and you couldn't see it.

Remove Vivaldi block

Stop waiting for non scratch fonts to load.

Update scratch-render to the latest version 

Wrap the stage canvas so that styles are not directly applied to it, fixing bounds calculations

Bump scratch-vm

Pin eslint-plugin-react because v7.12 has a bug causing erroneous fails

Change WebGL link

Use the loading screen in player mode