Introducing setup_for_film functionality

It is now possible, only for user with admin capability, to setup a
project as ‘film’. This action can be performed via CLI using
./manage.py cloud setup_for_film <project_url> or via the web
interface in the Cloud settings area.
Setting up a project for film creates a number of extension props
under the ‘cloud’ key. Such properties are listed in the
cloud_extension_props variable in setup.py.

At this moment the functionality exists for a very specific purpose:
improving the presentation of public Film projects in the Blender
Cloud. It can be further extended to improve the presentation of
Training and Libraries later on.

src/templates/project_settings/cloud_layout.pug

@@ -0,0 +1,21 @@
+| {% extends 'projects/edit_layout.html'  %}
+| {% set title = 'cloud' %}
+| {% block page_title %}Blender Cloud settings for {{ project.name }}{% endblock %}
+
+| {% block head %}
+script(src="{{ url_for('static_attract', filename='assets/js/generated/tutti.min.js') }}")
+| {% endblock %}
+
+| {% block project_context %}
+.container-fluid
+	.row
+		.col-md-12
+			h5.pt-3 {{ self.page_title() }}
+
+			hr
+
+#node-edit-container
+	| {% block cloud_container %}
+	| {% endblock cloud_container %}
+
+| {% endblock project_context %}