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Bug fixes:
- Analytics viewlet: make webstats_js a property, so that it does not rely on an a call to the update method to be correctly evaluated [ale-rt] (227)
- Code formatting according to Plone standards (black, isort).
[thet] (230)
- Remove selectedTabs and update method from GlobalSectionsViewlet as both are now unused.
[thet] (231)
- Remove deprecation warnings [ale-rt] (233)
- Integrate Plone20200121 hotfix: prevent XSS in title.
Part of https://plone.org/security/hotfix/20200121/xss-in-the-title-field-on-plone-5-0-and-higher
[maurits] (3021)