add IndirectArrays #48
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This adds IndirectArrays as an ImageIO dependency to support indexed image format. Because IndirectArrays is a very light package, it adds merely no latency to ImageIO.
For other image types, e.g., pyramidal image supported by TiffImages. We could do the same thing here, i.e., separating the array definition into a light package similar to IndirectArrays.jl and adding it here. (cc: @tlnagy)
This way we can introduce it to ImageIO and also ImageCore. See also the recent note on JuliaImages's philosophy JuliaImages/ImageCore.jl#180; I'm considering supporting various image layout formats in ImageCore.
Closes #47