Spirit.plone.theming

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- Nothing changed yet.

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- Add Plone 5.2.x compatibility (Python 2.7 only).
[tmassman]
- Drop Plone 4.2.x compatibility.
[tmassman]
- Disable CSRF on controlpanel form due to plone.formwidget.namedfile temp storage.
[tmassman]

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- Phone numbers starting with a '+' are getting a '00' country code prefix.
[tmassman]
- Replace deprecated plone.directives.form with plone.supermodel to remove grok dependencies.
[tmassman]

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- Remove 'slideshow_fullscreen' option.
[tmassman]

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- Add snippets to show availability of theming addons.
[tmassman]

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- Instead of providing a diazo snippet for the logo, provide a custom logo viewlet.
[tmassman]