Squashed 'frontend-user-management/' content from commit 597d133

git-subtree-dir: frontend-user-management
git-subtree-split: 597d1338775844fbdf5b48d5adbc9248c65ac38e
Merge commit 'c8a38a31cb014bb04e56e5306bf74a606a13a225' as 'frontend-user-management'
Added filter for 'fum_option_page_entries' to remove the fum admin menu (will be integrated in the ems admin menu)