Collective.portletmetadata

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- Nothing changed yet.

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- Drop support for Plone 5.

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- Add field "Custom CSS classes".
You can use this to freely add any (Bootstrap) classes, on top of the CSS classes made available in the control panel.
The new field and the existing control panel are now only available when you have the new "Portlets: Manage metadata" permission.
By default Manager and Site Administrator have this.
Previously only a Manager could access the control panel and make CSS classes available.
[maurits]

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- Make our patches have no effect when the product is not activated.
Until now, when a portlet was marked as local, it was still invisible elsewhere when the product was deactivated,
and you could no longer change the setting.
[maurits]

- Fix uninstall to remove our registry settings. [maurits]

- Have a different template override for edit manager macros on Plone 6.
This uses Bootstrap 5 classes.
[maurits]

- Fix ImportError on Plone 6, for isDefaultPage.
[maurits]

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- Fix Plone 5.0 support by downgrading the minimum ``plone.app.portlets`` version to be 3.0.0.
The 3.x series of plone.app.portlets is the version used by Plone 5.0.
[JeffersonBledsoe]

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- Fix for Plone 5.2 and Python 3 compatibility.
Should still work on Plone 5.0 and between as well.
[maurits]