Converts the dates on the dashboard, sidebar navigation, and important course dates to user specified time zone.

Center cards and add padding around logos. ECOM-4871.

Displays a message and link when a user is enrolled in a program's course run but must upgrade in order to be eligible for the program certificate. ECOM-4220.

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

ECOM-4219 - Add the course states to course cards and make sure the display follows course states (#12844)

Please enter the commit message for your changes. Lines starting

Allows staff using "view as specific student" mode to bypass edx-proctoring
hiding special exams from students, to allow for more useful debugging.

Includes "shim" pattern library implementation of alerts, and a bokchoy
test for this functionality.

Part of ECOM-4224.

Part of ECOM-4224.

This line can safely be removed since it does not impact
styling (nothing is being supplied to calculate).

Reference [here](http://www.w3schools.com/cssref/func_calc.asp)

This was a typo that was missed, and is not resulting in any styling.

Removing it is a no-op.

The original committer does not work in this code anymore, and
it is old enough such that changing it would be more disruptive.

ECOM-2361

Adds cohorts as valid bulk email targets.

TNL-4622

ECOM-4218 Draft 2 to add course card styles

TNL-4356

Allows multiple bulk email targets to be specified at once.

-The previous "All" option has been split into "Staff" and "Learners"
-The backend changes made here lay the groundwork for cohort emailing
-The data migration, 0005, is somewhat large and requires deploy attention
-Tests have been updated
-Numerous safe-commit-linter fixes are included

ECOM-4398

ECOM-2981