thumbnail: add support for other options #135
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I have added a capability to add additional options to the thumbnail methods. I've done this by creating a separate options object, in a new package, so this is a bit of an opinionated suggestion for how to tackle the various additional options on other vips functions.
It isn't finished, as I'm not sure how to build the function arguments dynamically (so we can omit those that aren't specified). I need to achieve that to implement support for import and export profiles, and I'd like to apply that to scale and crop etc so if they're not specified in the options, they're not specified to vips, letting vips apply the defaults itself.
I will also add documentation, if you generally like / agree with this approach!