Stop if user has some condition

[fumikito]

Add hook to validation.

• nlmg_can_resign( $user_id );
• nlmg_resign_conditions( $user_id )

if ( nlmg_can_resign( $user_id ) ) {
    // Render resign buttons.
} else {
    foreach ( nlmg_resign_conditions( $user_id  ) as $key => $condition ) {
         // $condition['label']
         // $condition['valid']
    }
}

[fumikito]

Add filter for removable conditions.