EDUCATOR-1448

Modifies paver webpack task to use production configuration in all
non-devstack environments, and a development config in devstack.

Please enter the commit message for your changes. Lines starting

* Change settings default
* Set `ENABLE_CREATOR_GROUP` to False for devstack
* Set `ENABLE_CREATOR_GROUP` to False for tests

In f095c5fe it was decided to enable
anyone to make courses in Studio by default in order to make things
easier in dev environments. This was before the code was open source.
This default is likely in effect for many Open edX instances, but almost
no one would want this setting outside of development.

There's a [bug](https://github.com/jazzband/django-debug-toolbar/issues/792)
that prevents wrapped views from working properly with the profiling panel.

Disable it by default.

An important step towards being able to use Studio's program editor out of the box. Part of ECOM-4638.

2. Update COMPREHNSIVE_THEME_DIR to COMPREHENSIVE_THEME_DIRS
3. Update paver commands to support multi theme dirs
4. Updating template loaders
5. Add ENABLE_COMPREHENSIVE_THEMING flag to enable or disable theming via settings
6. Update tests
7. Add backward compatibility for COMPREHEHNSIVE_THEME_DIR

This reverts commit 266f593d.

This reverts commit a796b563.

Conflicts:
	lms/envs/common.py
	openedx/core/djangoapps/theming/models.py
	pavelib/assets.py
	pavelib/paver_tests/test_assets.py

ziafazal: improvements need for multi-tenancy
ziafazal: fixed broken tests
ziafazal: no need to add setting in test.py
ziafazal: added hostname validation
ziafazal: changes after feedback from mattdrayer
ziafazal: fixed branding and microsite broken tests
ziafazal: make STATICFILES_DIRS to list
ziafazal: added theme directory to mako lookup for tests
ziafazal: added more protection in test_util
saleem-latif: Enable SCSS Overrides for Comprehensive Theming
saleem-latif: Incoporate feedback changes, Correct test failures, add tests and enable theming for django templates
saleem-latif: Correct errors in python tests
mattdrayer: Fix invalid release reference
mattdrayer: Update django-wiki reference to latest release
saleem-latif: Update Theme storages to work with Caching, Pipeline and collectstatic
saleem-latif: Incorporate feedback changes
mattdrayer: Pylint violation fix
mattdrayer: Fix broken pavelib test

This reverts commit 954dae58.

ziafazal: improvements need for multi-tenancy
ziafazal: fixed broken tests
ziafazal: no need to add setting in test.py
ziafazal: added hostname validation
ziafazal: changes after feedback from mattdrayer
ziafazal: fixed branding and microsite broken tests
ziafazal: make STATICFILES_DIRS to list
ziafazal: added theme directory to mako lookup for tests
ziafazal: added more protection in test_util
saleem-latif: Enable SCSS Overrides for Comprehensive Theming
saleem-latif: Incoporate feedback changes, Correct test failures, add tests and enable theming for django templates
saleem-latif: Correct errors in python tests
mattdrayer: Fix invalid release reference
mattdrayer: Update django-wiki reference to latest release

Collectstatic failed in production when comprehensive theme contained custom css files.
This patch fixes that problem by removing ComprehensiveThemeFinder from STATICFILES_FINDERS
and ComprehensiveThemingAware mixin from STATICFILES_STORAGE.

Comprehensive theme static dirs are added to the top of the STATICFILES_DIRS entry,
which means that the default django FilesystemFinder will find theme static files,
and since the theme folder is at the top of STATICFILES_DIRS, theme files will take
precedence over default LMS/CMS static files.

This change means that theme static file URLs are no longer prefixed with themes/<theme-name>/,
but since we currently only support one comprehensive theme at a time, that shouldn't be a problem.
If/when we want to make the choice of a theme dynamic per-request (microsites?), we will have to
bring custom theme finders and storage mixins back, but for now, we don't need them.

Extends the Programs ConfigurationModel, cleans up Programs-related utilities and corresponding tests, and corrects caching. Uses the Programs API to list programs within Studio. ECOM-2769.

Please note that this is a squshed commit and the work of:
Symbolist, macdiesel, nedbat, doctoryes, muzaffaryousaf and muhammad-ammar

Squashing private settings import errors leads to wasted developer time when developers expect settings to be in place, and they aren't. This change only loads private settings if the private.py file exists. If there is an error during the import of that file, the application will not start.

ECOM-2653

TNL-3137

TNL-3137

TNL-3137

TNL-3137

TNL-3137

TNL-3137

When running locally, XBlocks which access third-party software no longer
cause server errors.

Because devstack inherits from aws, the HTTPS flag was implicitly set to 'on'.
This meant that XBlocks attempted to use SSL when dealing with third-party
components like LTI.  Since SSL is not enabled on devstack, this caused server
errors whenever these features ran.