SAML2 Improvements and redirect stuff #5316
This is a "draft" right now and doesn't really comply with the guidelines of this repository / project (will work on the PR changelog file when I refined my changes). I just want to put out my changes to get SAML2 SSO working for me, so that other people can enjoy SAML2 with Matrix.
There are still things to fix:
Please let me know what would needs to be improved to get this PR ready for review and / or merge.
Could potentially close #5130 when a SSO logout endpoint has been proposed and implemented?
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