Adds color components decoding to the JPEG
Adds CMYK JPEG test
Optimized loops in JPG conversion.

This change makes the 4 conversion loops look the same.
It optimizes access of the array length and access of the property
numComponents, which is known to be constant.
Merge pull request #4886 from yurydelendik/issue4883

Adds color components decoding to the JPEG
Fixes typo in getAsync
Updates l10n
Merge pull request #4891 from yurydelendik/typo

Fixes typo in getAsync
Merge pull request #4889 from CodingFabian/optimize-jpg-loops

Optimized loops in JPG conversion.