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genesys: Add 4800dpi support for Canon LiDE 210 & 220

Matthew Petroff requested to merge mpetroff/backends:lide-210-220-4800dpi into master

This branch adds 4800dpi support for the Canon LiDE 210 & 220 scanners, which should resolve issue #204 (closed).

It's based on USB logs collected with the Windows driver for the LiDE 210 scanner. I tested all the resolutions on both scanners after the changes. Both grayscale and color were tested for the LiDE 210 scanner, but only grayscale was tested for the LiDE 220 scanner (my LiDE 220 scanner has the LED removed, so I can't test color, although I don't expect any issues with it).

The x_offset values in the models tables were reduced because the total number of pixels was being exceeded.

The shading data segment iteration was also simplified.

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