Refactor autogenerate feature

[kitzberger]

This feature allows to specify the 'variants' via TypoScript with the two parameters: factor and fileExtension

Example for CType image:

tt_content.image =< lib.contentElementWithHeader
tt_content.image {
    fields {
        content {
            fields {
                gallery = TEXT
                gallery {
                    dataProcessing {
                        10 = FriendsOfTYPO3\Headless\DataProcessing\FilesProcessor
                        10 {
                            references.fieldName = image
                            as = files
                            processingConfiguration {
                                delayProcessing = 1
                            }
                        }
                        20 = FriendsOfTYPO3\Headless\DataProcessing\GalleryProcessor
                        20 {
                            maxGalleryWidth = {$styles.content.textmedia.maxW}
                            ...
                            as = gallery
                            # Legacy options (internally migrated to new "formats" option)
                            autogenerate {
                                retina2x = 1
                                lqip = 0
                            }
                            formats {
                                publicUrl_webp {
                                    fileExtension = webp
                                    factor = 1.0
                                }
                                publicUrl_tinyJpg {
                                    fileExtension = jpg
                                    factor = 0.2
                                }
                            }
                        }
                    }
                }
            }
        }
    }
}

Related: #617

[coveralls]

Pull Request Test Coverage Report for Build 8158417726

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 64.411%

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Totals
Change from base Build 7816540853:	0.0%
Covered Lines:	847
Relevant Lines:	1315

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💛 - Coveralls

[kitzberger]

@twoldanski, what do you think of this approach? I'm thinking of renaming autogenerate to something more catchy, like maybe 'variants' or 'formats'?

[kitzberger]

I've added some documentation and taken the liberty to declare the old mechanic as deprecated because the new system is slightly better, I believe.

[twoldanski]

Thank for contribution! With larger refactor in #724 I back ported patch & tweak a bit your code, but functionally it is there.