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Two more questions related to bluetooth on ChromeOS/Android.

They should only be visible if either Chrome or Android is selected, and the `CHROME_APP_RELEASED` feature flag is true.

Add privacy policy and link to the email step.

Switch to using scratchr2 check_username endpoint instead of api. 

Switch to using scratchr2 check_username endpoing instead of api. There are some cleanspeak differences with the api one that need to be resolved.

Add analytics logging to join flow.  

Revert "Revert "fixed country options to use full country name string as option value""

Fix tag on username step.

Set sendAnalytics to be required and send the right props to the error step. Also add a test for the error step.

username step and email step caches ignore api failures

Join flow: custom error messages, retry rules for various particular registration error causes

Greenkeeper/scratch gui 0.1.0 prerelease.20191105010907
brings in LLK/scratch-svg-renderer#99 via gui

Closes #3502