Revisit the image manipulators

[hellopablo]

• PHPThumbMaster is abandoned, replace
• Add support for optimisers like ImgOptim
• Improve support for larger images (e.g. 50Mb gifs)
• Smart crop

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Potential libraries:

• https://github.com/kosinix/grafika

[shauunhimseelf]

Feature request - ability to set an offset top and offset left to fine tune the positioning of the crop. Could also consider smart crop features to automatically target regions like faces etc.