Automatically crop whitespace

[LordMike]

As foretold by the docs, I have huge blobs of whitespace on my map. Would it be possible to create a feature that automatically crops this, by removing all-white rows and columns of pixels?

[LordMike]

Note, I've found a quick way to do this. Jimp has an autocrop feature.

[alceasan]

Thanks @LordMike, it works like a charm. Manual cropping doesn't work very well, but using autocrop isn't necessary in my opinion.

We could use a new conf variable to set autocrop, and just make the image.autocrop() call in Tools.js depending on its value.