Re-write function for patch cropping to return an iterator

[zakajd]

Closes #282

Proposed Changes

• Changed function to iterate over image patches instead f generating all of them at once.

Pros: Memory consumption is significantly reduced, especially for large images

Cons: Inference time is also significantly increased.

After internal discussion decided to leave everything as is. For large images it's recommended to use higher values of PieAPP stride parameter.

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