setuptools to a specific version for now.

XBlock is listed as a dependency in requirements files for xblock-sdk,
xblock-utils, and problem-builder itself. These files list different (but compatible)
versions of the XBlock repo. Because of that, XBlock gets installed multiple times
when installing dependencies for CircleCI builds.

Starting with setuptools 25.0.0, the behavior for installing packages on top of
existing installs changed; see https://github.com/pypa/setuptools/issues/729
for an example issue that this change in behavior caused.

For problem-builder CI builds, the issue was that after installing all dependencies,
the egg link for XBlock ended up pointing to the installation of problem-builder itself,
creating a situation where the code that ships with XBlock was not accessible from modules
that depend on it. This caused imports for any classes defined in the XBlock repo to fail,
and CircleCI builds errored out.

To fix this, we temporarily pin setuptools to the most recent version
that does not exhibit this behavior (24.3.1).

An upstream fix seems to be underway (via https://github.com/pypa/pip/pull/3904),
but it hasn't been merged/released yet.

New version includes fixes from https://github.com/edx/xblock-utils/pull/38 and https://github.com/edx/xblock-utils/pull/39.

Hide MRQ question-level feedback on return.

When the pb_mcq_hide_previous_answer is set to True, question-level
feedback should not be displayed when user returns to the page.

Stopping video playback for hidden steps

Enable freeform answer submit when feedback is hidden

When problem builder is configured to hide feedback upon revisiting a question
(pb_hide_feedback_if_attempts_remain option is enabled), when the user returns
to a problem builder block which contains only a freeform question,
the user is not able to click "Submit" without changing the answer text first.

This patch fixes that by keeping submit button enabled if
pb_hide_feedback_if_attempts_remain is turned on.

MCKIN-3890

StepBuilder: Fix inconsistent feedback for MCQs

When the pb_mcq_hide_previous_answer is set to True, MRQs should behave
the same way as MCQs behave - previous choices should not be displayed
and the checkmarks should be hidden.

Add instructions for enabling dashboard in studio

Use dashboard image from master branch in tests

So that the omar/report-download branch can be deleted

Fix dashboard report image download

Restore functionality for showing choice tips on click

Problem Builder: Add instance-wide option to hide global feedback and results for Long Answer blocks

- More neutral default for "get_option"
- Separate integration tests for checking persistence behavior

feedback should be shown when student returns to block.

The new setting is called "pb_hide_feedback_if_attempts_remain".

When set to True, Problem Builder blocks will not show global feedback
messages (as long as one or more attempts remain), and will hide
results (correct/incorrect icons) for Long Answer blocks.

OC-1387 Always show tooltips feedback if tips are present.

Ensure default theme is used if theme has not been customized

Problem Builder: Add instance-wide option to hide previous answers for MCQs

- Refactor: Take advantage of mixins from xblock-utils accessing xblock settings.

- Fix existing tests.
- Add unit tests for code that deals with instance-wide options.
- Add integration test for scenario where previous answers for MCQs are configured to be hidden.

MCQs are shown when users revisit them.

blocks works in both Apros and the LMS.

Fix exponential rerendering after hitting next button too many times.