Bug fixes

Add spam checking for existing users/comments
Add plugin settings to a new configuration tab
Improve JS checking
X-autoload for lib files
Add forms validation
New settings page
Bug fixes and other minor improvements

Issues:

• #2933549: Incompatible with simple_sitemap 8.x-2.12

This release fixes a number of issues. Many of them were only having to do with updates to the automated test suite, and replacing deprecated Core code calls with updated calls.