Bump dependencies. Some parts needed to be deactivated for that. They need to be reimplemented.

- breadcrumbs (!flask-breadcrumbs)
- manual modal button
- api blueprint (!flask-marshmallow/!marshmallow-sqlalchemy)

app/settings/routes.py

@@ -1,12 +1,10 @@
 from flask import g, url_for
-from flask_breadcrumbs import register_breadcrumb
 from flask_login import current_user
 from app.users.settings.routes import settings as settings_route
 from . import bp
 
 
 @bp.route('/settings', methods=['GET', 'POST'])
-@register_breadcrumb(bp, '.', '<i class="material-icons left">settings</i>Settings')
 def settings():
     g._nopaque_redirect_location_on_post = url_for('.settings')
     return settings_route(current_user.id)