Squashed 'frontend-user-management/' changes from 597d133..f47c533

f47c533 Added apply_filter ''fum_option_page_entries" so other plugins can remove the option page

git-subtree-dir: frontend-user-management
git-subtree-split: f47c5334277506975bcb140619afe2fd66a5ffd0
Merge commit 'f1c9d30140e38db88690620fb88b975a6182e1b1' into experimental