misc: remove formpage alteration (#73965)
misc: remove unused alternate root directory (#73613)
misc: remove custom category attributes (#72817)
misc: remove custom backoffice class (#72816)
remove settings panel (#64972)
remove obsolete payment stuff (#64972)
misc: extend category bits instead of replacing them (#53667)
trivial: apply black
remove obsolete abelium domino modules (#17244)
remove support for strongbox (#37967)
remove support for announces (#37967)
remove support for agenda/events (#37967)
remove support for custom links (#37967)
misc: use relative imports (#36518)
backoffice: update to match categories move under forms/ (#7457)
misc: change module name and installation directory (#17959)