Reinstate correct location for saving settings values
Fix paging of LTI Users table
Avoid headers already sent notice
Fix bug with deleting blogs
Add uninstall options to delete LTI tables and blogs

Add support for registration message (based on the Moodle implementation as the final spec has not yet been published).

Updated to the latest version of the LTI class library which includes support for LTI 1.3
Changed teminology from Tool Consumer to Platform in line with the changes made by IMS
Added support for installation using Composer
Added configuration URLs for Canvas (required to workaround a bug in its signature generation)

Updated to include support for mysqli 5.1.72 (and earlier).