Add basic "show more" pagination for the backpack

added simple spinner component

* Use target id in volume reporter block

* update VM

Fix problem with updating cloud vars to zero.

when user clickes File->New, only save if user can save

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

Added a unit test and covered the other case (not used) where you might be trying to update the index zero of a list

Closes #3646

Revert "Blur language select focus when mouse leaves"

Add pointer-events:none to sprite img to prevent dragging.

don't require onActivatedBlocksTab prop in TargetPane container

Fix dropdowns on backpack items being transparent

The blend-mode property was being set on the whole thing, rather than the image only

draggable=false is not enough for firefox

correct wrong assetId prop name

Add reconnect button to hardware disconnect alerts

Update vm to pull in hotfix for sprite upload from image.

Blur language select focus when mouse leaves

Initial "pictures of blocks" implementation for the backpack

Update scratch-vm to the latest version