Silverstripe 5 support

• Support Silverstripe 5
• Move SEO fields to their own tab (configurable)
• Add configuration options to change the tab name and configure SEO field to be open by default

1.1.2

Defends against deprecations calling string functions under PHP 8.1

1.0.3

• Handle case when body element is not found. #39

1.0.2

• Render html using render() rather than file_get_contents etc #35

1.0.1

Temp fix for new pages #32

See new issue at #33 which will be resolved as soon as possible

1.0.0

Merge pull request #13 from zanderwar/fix/9/extension-pollution

FIX over pollution of methods from extensions