Add ability to identify HEIC/HEIF files with appropriate content/type - mime/type

[SirCodesALot]

Recently, I was testing uploading and converting HEIC files to JPEG on the server and was hoping to use the mime/type (or content/type) that was being sent from the browser rather depending solely on a file extension (.heic).  While testing, I noticed that Firefox was defaulting to application/octet-stream rather than what I expected image/heic media type as described at IANA.

Would it make sense though to have support more of the media types at IANA as well??

All that said, I'd like to have this feature added and am willing to contribute (which I will explore in the near future). I was curious if there was any other demand.

[Jon]

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