Update scratch-l10n to the latest version 

Sort variable options in "of" block

require text-encoding only if it is needed

Set an initial message number to skip rendering a second time

chore(package): update scratch-vm to version 0.2.0-prerelease.2019020…

chore(package): update scratch-render to version 0.1.0-prerelease.201…

Closes #4513

Multiple file upload for costumes, sounds, backdrops and sprites

Closes #4510

Merge pull request #4512 from LLK/revert-4501-greenkeeper/scratch-render-0.1.0-prerelease.20190206213754

Revert "Update scratch-render to the latest version "

chore(package): update scratch-vm to version 0.2.0-prerelease.2019020…

Closes #4506

Use blob download instead of data-uri to enable large downloads

This was already being used for sb3s and sprite3s, but the code was repeated in different places. Make a single helper that downloads blobs, and make all download paths use it.

chore(package): update scratch-vm to version 0.2.0-prerelease.2019020…

Closes #4503

Update scratch-render to the latest version 

Update scratch-blocks to the latest version 

Update scratch-l10n to the latest version 

Update scratch-blocks to the latest version 

chore(package): update scratch-vm to version 0.2.0-prerelease.2019020…

Closes #4480

Wait until loader becomes stale to continue in project loader tests

Escape special characters in toolbox xml

Including sprites, backdrops, costumes and sounds inputs