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merge from develop to release branch

Merge pull request #4304 from LLK/dependabot/npm_and_yarn/scratch-gui-0.1.0-prerelease.20200812071833

Bumps [scratch-gui](https://github.com/LLK/scratch-gui) from 0.1.0-prerelease.20200806193351 to 0.1.0-prerelease.20200812071833.
- [Release notes](https://github.com/LLK/scratch-gui/releases)
- [Commits](https://github.com/LLK/scratch-gui/compare/0.1.0-prerelease.20200806193351...0.1.0-prerelease.20200812071833)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [scratch-l10n](https://github.com/LLK/scratch-l10n) from 3.10.20200805030706 to 3.10.20200812030801.
- [Release notes](https://github.com/LLK/scratch-l10n/releases)
- [Commits](https://github.com/LLK/scratch-l10n/compare/3.10.20200805030706...3.10.20200812030801)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

[Develop] Hotfix/messages

Update sign-in-and-out integration tests for new chromedriver

[master] Hotfix/messages

This reverts commit c5f83e86.

Exponentially back off the time between message polling.

Merge pull request #4288 from LLK/dependabot/npm_and_yarn/scratch-gui-0.1.0-prerelease.20200806193351

Bump chromedriver from 76.0.0 to 84.0.1

Bumps [scratch-gui](https://github.com/LLK/scratch-gui) from 0.1.0-prerelease.20200806190218 to 0.1.0-prerelease.20200806193351.
- [Release notes](https://github.com/LLK/scratch-gui/releases)
- [Commits](https://github.com/LLK/scratch-gui/compare/0.1.0-prerelease.20200806190218...0.1.0-prerelease.20200806193351)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Make the cookie library set the SameSite cookie value to Lax by default

Bumps [chromedriver](https://github.com/giggio/node-chromedriver) from 76.0.0 to 84.0.1.
- [Release notes](https://github.com/giggio/node-chromedriver/releases)
- [Commits](https://github.com/giggio/node-chromedriver/commits)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

[Develop] Release 2020-08-06

[Master] Release 2020-08-06

Puts back the original change but sets the default to Lax instead of Strict. Scratchr2 needs these cookies sent on top level navigations.

Prepare release branch with latest changes from develop

Merge pull request #4276 from LLK/dependabot/npm_and_yarn/scratch-gui-0.1.0-prerelease.20200805054801

Bumps [scratch-gui](https://github.com/LLK/scratch-gui) from 0.1.0-prerelease.20200804162018 to 0.1.0-prerelease.20200805054801.
- [Release notes](https://github.com/LLK/scratch-gui/releases)
- [Commits](https://github.com/LLK/scratch-gui/compare/0.1.0-prerelease.20200804162018...0.1.0-prerelease.20200805054801)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [scratch-l10n](https://github.com/LLK/scratch-l10n) from 3.10.20200729030742 to 3.10.20200805030706.
- [Release notes](https://github.com/LLK/scratch-l10n/releases)
- [Commits](https://github.com/LLK/scratch-l10n/compare/3.10.20200729030742...3.10.20200805030706)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Fix bad variable interpolation/calculation in frameless scss

Merge pull request #4270 from LLK/dependabot/npm_and_yarn/scratch-gui-0.1.0-prerelease.20200804162018

Bumps [scratch-gui](https://github.com/LLK/scratch-gui) from 0.1.0-prerelease.20200731053101 to 0.1.0-prerelease.20200804162018.
- [Release notes](https://github.com/LLK/scratch-gui/releases)
- [Commits](https://github.com/LLK/scratch-gui/compare/0.1.0-prerelease.20200731053101...0.1.0-prerelease.20200804162018)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Merge pull request #4258 from LLK/dependabot/npm_and_yarn/scratch-gui-0.1.0-prerelease.20200731053101

Bump scratch-gui from 0.1.0-prerelease.20200730115315 to 0.1.0-prerelease.20200731053101

This used to work, even though it shouldn’t have. Upgrading node-sass caused our breakpoints to … break

Bumps [scratch-gui](https://github.com/LLK/scratch-gui) from 0.1.0-prerelease.20200730115315 to 0.1.0-prerelease.20200731053101.
- [Release notes](https://github.com/LLK/scratch-gui/releases)
- [Commits](https://github.com/LLK/scratch-gui/compare/0.1.0-prerelease.20200730115315...0.1.0-prerelease.20200731053101)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

[Develop] Hotfix/cookie rollback

Hotfix/cookie rollback Revert samesite cookie change

Update node version used by travis and node-sass

Revert 4219 update cookie jar