Improvements for SEO

Removing error pages from sitemap, and adding the last modified date for each page

Reverting SiteMapPage to Use Original Method

Release 2.0.3 utilized the SiteTree::get() which in turn broke the human friendly version of site tree. This release reinstates the old method call.

Updating Queued Jobs

https://www.symbiote.com.au/blog/symbiote-and-the-silverstripe-community

Adding Missing Fields

Adding missing fields so that they are no longer required in the project.yml file.

Observe ShowInMenus and ShowInSearch

Add option to filter sitemap byShowInMenus and/or ShowInSearch page setting.

Child fix and reformatting

Refactored get children to utilize SiteTree::get and reformatted all php files to psr2 standard.