Phpstan level 4

[workaj]

does what it says on the tin

note:

• looks like phpstan isnt exactly happy with adminpath being a path, and also false depending on which index file the cms is load through, so for now i have disabled checks above lines that use it. might need to revisit this in the future
• includes a bugfix for email not working in admin https://github.com/HoltBosse/Alba/pull/375/commits/fa63a1f0bad2f016a417574a53213e01f4fd514a