Add new audio/video artefact types

[François Marier]

Initially this will give audio/video files a distinct icon, but could in theory be enhanced later on.

[François Marier (fmarier)]

https://reviews.mahara.org/#change,543

[Mahara Bot (dev-mahara)]

Reviewed: https://reviews.mahara.org/543
Committed: http://gitorious.org/mahara/mahara/commit/d644694205661c554488656bd8689fc32ad76555
Submitter: Francois Marier (<email address hidden>)
Branch: master

commit d644694205661c554488656bd8689fc32ad76555
Author: Stacey Walker <email address hidden>
Date: Mon Feb 21 17:01:31 2011 +0000

    artefact/file: new video/audio classes (bug#829136)

    Change-Id: Ia6df631512795b68e1eba7906220803ca3a7f500
    Signed-off-by: Stacey Walker <email address hidden>

[Mahara Bot (dev-mahara)]

Reviewed: https://reviews.mahara.org/678
Committed: http://gitorious.org/mahara/mahara/commit/7860521576e2aa6cda3c9dfadc6efea48866a461
Submitter: Richard Mansfield (<email address hidden>)
Branch: master

commit 7860521576e2aa6cda3c9dfadc6efea48866a461
Author: Richard Mansfield <email address hidden>
Date: Mon Sep 12 12:48:13 2011 +1200

    Stop unknown file types being detected as audio files (bug #829136)

    Commit d644694205 created a new audio file type with a list of indexes
    into the mimetype table for audio mimetypes. However, the numeric keys
    of the 'descriptions' array were being used to fetch audio mimetpes
    instead of the values, which resulted in files with undetected
    'application/octet-stream' mimetypes becoming audio artefacts after
    upload.

    Change-Id: I418fc8b864088269fcddcffcb56346e8f9bb78ee
    Signed-off-by: Richard Mansfield <email address hidden>

[Melissa Draper (melissa)]

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