Cpskin-core

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- Let town decide if contact.core person properties fallback out of person's function or not. Add new registry params and upgrade steps.
[boulch]

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- Get related contact title in unicode to fix WEB-3017.
[bsuttor]

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- Don't display social-viewlet if there are no social links : WEB-3027
[laulaz]

- Add body classes for header, navigation, content and footer blocs : WEB-3027
[laulaz]

- Add body class for minisite (independant of mode)
[laulaz]

- Make footer sitemap optional. It will then be removed in the future : WEB-3027
[laulaz]

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- Release to readd package on devpi
[bsuttor]

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- Handle target blank links in sliders : WEB-3013
[laulaz]

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- Avoid error when checking on Event class if Folderishtypes are installed
[laulaz]

- Avoid error when show_day_and_month is set to True on a collection without
events : WEB-3004
[laulaz]