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/users/settings/routes.py

@@ -1,9 +1,7 @@
 from flask import abort, flash, g, redirect, render_template, url_for
-from flask_breadcrumbs import register_breadcrumb
 from flask_login import current_user
 from app import db
 from app.models import Avatar, User
-from ..utils import user_endpoint_arguments_constructor as user_eac
 from . import bp
 from .forms import (
     UpdateAvatarForm,
@@ -15,7 +13,6 @@ from .forms import (
 
 
 @bp.route('/<hashid:user_id>/settings', methods=['GET', 'POST'])
-@register_breadcrumb(bp, '.entity.settings', '<i class="material-icons left">settings</i>Settings', endpoint_arguments_constructor=user_eac)
 def settings(user_id):
     user = User.query.get_or_404(user_id)
     if not (user == current_user or current_user.is_administrator):