Focus on the last input when opening custom block modal

Adds "run without screen refresh" to block editor.

Add size and remove rotation style from sprite info area.

Merge pull request #1113 from LLK/greenkeeper/scratch-vm-0.1.0-prerelease.1513889734-prerelease.1513889749

Update scratch-vm to the latest version 🚀

Update looks palette ordering, including "next backdrop" in sprite.

- implements welcome to the preview modal, and unsupported browser modal.
- will need assets updated in Jan.

Add default "count" variable

Add 99 max undo stack size for sound editor

Fixes #993

Update scratch-blocks to the latest version 🚀

Remove border to stop backdrop count from looking like an input.

Update graphics effects blocks to use scratch2 default values.

Fixes https://github.com/LLK/scratch-gui/issues/1103

Update scratch-blocks to the latest version 🚀

Update scratch-render to the latest version 🚀

Change category name from "Data" to "Variables"

Change modal title to "Make a Block"

Change "More" category to "My Blocks.

Update scratch-audio to the latest version 🚀

Merge pull request #1088 from LLK/greenkeeper/scratch-vm-0.1.0-prerelease.1513799362-prerelease.1513799374

Update scratch-vm to the latest version 🚀

Fixes https://github.com/LLK/scratch-gui/issues/1064