Bug fix and improvements

Remove Single Logout (Need fix).
minor improvements

Bug fix and improvements

Fix bug feuser login error
Fixed Single Logout
Updated UI to show premium plugin stuff
Lots of internal changes
Remove redundant stuff to decrease size.

Support for typo3 v9 and linux

• fixes for compatibility with Typo3 v9 (till v9.5.13)
• fixes for compatibility with Linux.
• improved UI since v1.2.0
• other improvements

Some important bugs fixed

This is continuation of previous repo "typo3-saml-sso".
Hopefully most of the important bugs are fixed and did some UI improvements also.