Update scratch-render to get the babel-built version of fonts

Add instructions to PR template browser coverage section

remove question event listener on stage unmount

Fix linting errors from eslint-plugin-react

Update scratch render again to fix speech bubbles again

Fixes from smoke test

Including triple scrollbars on list monitors and fixing the say bubble fonts

Add dependencies that are updated by change to svg-renderer

Make slider and list monitors update variables in the VM

Update scratch-vm dependency

This fixes the music manifest issue.

Send svg renderer to vm

Update vm and blocks for block visibility

Fix uint16 sound loading error

Update VM to support importing monitors

Add "read-only" slider and list monitors.