Add an integration test for bitmap vector conversion

Make error catching and reporting better

Make sure no sentry config for local development

Fix stage naming by using intl.formatMessage instead of component.

Fixes #1955

Fix sentry config, used too many quotes

Also extract the "supportedBrowser" logic into a helper (rule of 3)

Move analytics things to environment vars

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

Closes #1949

Move ErrorBoundary back into the app, fix IE error boundary

Update scratch-render to the latest version 

Make remaining text translatable, and prevent future regressions

Bitmap import and export

Add sprites, costumes, and backdrops from Ipzy

Revert localization of crash message.

We realized that the VM actually uses actual rotation center, so I moved the point where division by 2 happens into the VM