Feature: add codec support for HLS (m3u8 and m3u formats)

[jbgomez]

Issue/Feature

• Add support for HLS file formats m3u8 and m3u.
• Fix bug where codec setup can execute more than once.

Solution

• Add HLS support via media type defined here.
• Change initial _codecs value to null to prevent _setupCodecs from executing more than once.

Reproduction/Testing

Native HLS support in Safari demo: https://developer.apple.com/streaming/examples/advanced-stream-ts.html

Breaking Changes

None.

[wasauce]

this is a great PR. We would love to see this merged (and plan to make use of this). Is there something we can do to promote this or help see it merged?

[jbgomez]

Thanks, @wasauce.

@goldfire, please let us know if there's anything we can do to help. We appreciate your work on this library!

[nam-nguyen-niteco]

@jbgomez your codepen doesn't exist. I've tried playing a HLS file but did not work

[jbgomez]

@nam-nguyen-niteco sorry, I must have deleted that CodePen by mistake. I have replaced the CodePen link with a demo from Apple's developer website. This demo is simply meant to showcase native application/vnd.apple.mpegurl support in Safari, which this PR would effectively ungate for Howler.js. To be clear, this PR does not implement HLS support for browsers that do not already natively support the application/vnd.apple.mpegurl media type.