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This commit addresses a problem where the following would produce a type
error, even though it was valid code:

setCanvasData({left: 23})

I have changed the argument type for all of the setXXX methods which
accept an object as their argument. In the spec files for cropperjs,
@fengyuanchen uses these objects as partials for setters. So I have
made the type definitions follow that same pattern.

I changed the cropperjs.CropBoxData type to act the same way as well.
It looks like it was changed at some point, I am guessing to allow it
to be used as a partial in the setCropBoxData method. Since, like all
the other data structures here, it contains all members when you get
it, I have made all members required parts of the object and changed
the setter method to accept a partial.

I hope this all makes sense. Basically, I went from the first line below
to the second.

setXXXXX(thing: cropperjs.SomeInterface): void

setXXXXX(thing: Partial<cropperjs.SomeInterface>): void

Then I changed cropperjs.CropBoxData to fit this new system.