Merge pull request #44 from open-craft/toxinu/general-feedback

[FAL-3225] Add general feedback for question

Case Studies/Teaching Guides return original item usage_ids (#43)

when returning data about their child attachments.

labxchange-xblocks#42 was only a partial fix -- it returned original item usage_ids for children of sections, but we forgot about attachments. This change fixes this.

Case Studies/Teaching Guides return original item usage_ids (#42)

when returning data about their children.

Fixes errors parsing question OLX (#41)

* Fixes errors in prod

Sometimes the node.text is None, and so running strip() on it causes an error.
Sometimes the node contains inner HTML, and so this needs to be treated
as content, not just text.

* Parses child nodes/inner html for question text only,

leaves hints and choice/options alone.
Also fixes parsing issues revealed by question_block_test by using the
xml tostring method instead of the lxml one, and adds some more tests.

Parses optionresponse answers sent from Open edX (#40)

and adds tests.

Open edX's CAPA single-answer optionresponse problems store the actual
content of the chosen answer instead of the index.

This change allows us to match the student's answer content with the
index of the chosen answer.

Merge pull request #39 from open-craft/giovanni/lx-2643-hls-support

LX-2643: fix: Short circuit `parse_xml` when loading videos

Merge pull request #38 from open-craft/jill/lx-2480

fix: handles transcript requests from LX's XBlockRuntime

Merge pull request #37 from open-craft/jill/LX-2480

LX-2480 fix: handles requests from LX's XBlockRuntime

Merge pull request #36 from open-craft/jill/LX-2506

Fixes issues introduced by using lx_block_types for select users

Merge pull request #34 from open-craft/chris/FAL-2904

[LX-2537] Fixing question set children bugs