Change list wraparound logic when shift-tab pressed

Share blocks to the stage

Disable double click and context menu in fullscreen

Change list monitor styles

Update scratch-vm and scratch-render

Force the tooltips to close to fix touch devices

Update deps

Replace platform with bowser for browser detection

Update Learning Activities

Move error boundary out beyond the project loader

Fix toolbox refreshing for new variables after switching tabs

Show username block in sensing

Add 'story' letters to libraries

Show a coming-soon backpack

Make costume, sound and sprite tiles draggable.

Make new default backdrop included in build

chore(package): update scratch-paint to version 0.2.0-prerelease.2018…

Add sound library tags for legacy sounds

Closes #1949

chore(package): update scratch-paint to version 0.2.0-prerelease.2018…

Add tags to many sprites and sounds