Initial integration of QTI and IMSCP import

[rtibbles]

• Does an initial integration of IMSCP import into ricecooker.
• Adds some simple utilities for mapping IMSCP/SCORM metadata fields to our metadata
• Allows proper mapping of embedded webcontent files to the entry option
• Writes tests to cover this behaviour

Fixes #332
Fixes #337

[rtibbles]

Looks like the way I am doing the zipfile testing is not compatible with Windows, open file handles etc - will need to update for that.

[jredrejo]

I had two problems ithe these few lines of code:
language was en-US
metadata.dict was this one:

(Pdb) metadata_dict
{'title': 'Work with computers', 'description': 'This learning path will introduce you to the different parts and types of the computer and their functions. You will also learn the difference between operating systems and applications and their functions. Peripherals and portable storage devices will be discussed as well.', 'language': 'en-US', 'keyword': 'Default'}

It worked with these changes (I ignore if the keyword change will work with other scorm files)

    if metadata_dict.get("language"):
        node.set_language(metadata_dict.get("language").lower().split("-")[0])
    keyword = metadata_dict.get("keyword")
    if keyword:
        node.tags = node.tags + [keyword,]

[rtibbles]

Updated - hopefully has a similar effect, add some additional validation to make sure it's a language we know.

[jredrejo]

This is producing a server error in Studio https://learningequality.sentry.io/issues/4997106816/?project=1252819

[jredrejo]

I've been playing with the latest code from this PR:

• Ricecooker works
• Uploading to Studio unstable works
• The channel appears correctly (preview doesn't work, but that's not a ricecooker problem) https://unstable.studio.learningequality.org/es-es/channels/6877a75b029e5259a02c93046ee6dd80 , token: kokom-fitih
• Using kolibri v0.16.1, I can see the channel, the structure is a bit weird, with more levels than expected: 1 single scorm file has up to four levels to access to the resource:
  
• After importing it, it does not work correctly, this is the error message:
  

[jredrejo]

Left a detailed comment with the two issues found