Update scratch-blocks to the latest version 

Menus should be over most things

Update scratch-vm to the latest version 

fixes https://github.com/LLK/scratch-www/issues/2587
and https://github.com/LLK/scratch-gui/issues/4428

changed menu-bar z-index to one more than monitors so drop down menus cover monitors when opened.

Update scratch-vm to the latest version 

Avoid double toolbox update on mount and when setting language

Move rounding into sprite info to improve performance

chore(package): update scratch-vm to version 0.2.0-prerelease.2019012…

Update scratch-render to the latest version 

Update scratch-vm to the latest version 

Update scratch-blocks to the latest version 

It also avoids repeating the costly object spread, which becomes a problem for projects with a lot of sprites

Closes #4443

Use fontInliner instead of entire SVGRenderer for showing costume tiles.

Sprite library animations no longer update the entire library state on every costume change

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

Update scratch-render to the latest version 

Update scratch-svg-renderer to the latest version 

Closes #4426

The fontInliner from the scratch-svg-renderer was changed recently to work entirely on strings, so we can use that instead of parsing/loading/possibly drawing/stringifying the entire SVG. 

This does not address the size-1 cache issue where the cache is invalidated any time there is more than 1 sprite. But that can be handled later.

Using the 4x CPU slowdown in chrome dev tools, on a simple costume that just has a single text element the getCostumeUrl time goes from 10ms to 1ms, very important for updating in a timely way.

Fix test broken in #4422 by updating the snapshot.

Add container with overflow hidden to prevent scrollbars from playhead