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imsc1 image subtitle support

Vinay Rosenberg requested to merge github/fork/TobbeEdgeware/imsc1-image-subtitle-support into development

Created by: TobbeEdgeware

Implementation of #1418 (closed).

An extension to support image subtitles packaged as ISOBMFF segments with png images in subsamples in the same sample as the TTML document. This required the implementation of a new box subs in the iso parser including codem-isoboxer.

This follows IMSC1 which disallows the base64-encoded embedded images in the TTML documents.

Support was also added to handle the extended codecs value stpp.ttml.im1i which what CMAF DIS lists as the proper value.

A new test asset has been produced and added to the reference player: http://vm2.dashif.org/dash/vod/testpic_2s/img_subs.mpd

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