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Detect and decode QR Codes, written in 100% Rust.

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Hi, when I scan the qr code [0], the content is recognized correct, but I also get the error `Error decoding QR Code: Unable to find alignment pattern` two times....

Hi is this project still being supported?

Add a CLI: ``` bardecoder file.png ```

Seems that QR Codes that have an empty center space to them are not readable by bardecoder. ![test-small-inline](https://user-images.githubusercontent.com/6754950/65283688-816c3480-daec-11e9-9aeb-bb3a996677eb.png) It's readable on my phone, so at least it's valid to whatever...

I tried parsing 2 barcodes. 1 of them was a QR code and one was a PDF417 barcode. The QR parsed with no problem. The PDF417 barcode, however, didn't parse....

![QQ截图20200522163219](https://user-images.githubusercontent.com/7031415/82648262-05f9ee80-9c4a-11ea-8e31-37fba616f4df.png) Qrcode value is "E2186ST19121788"

One of the rotated versions fails (`test_wild_rotated_1`), likely because the QR code is too tilted. We don't have to retain the other two tests, as these cases are pretty much...

I can't decode this test barcode: ![stresstest-only-120dpi](https://user-images.githubusercontent.com/2281400/80309555-d15a5a80-87a3-11ea-9338-4bc72f388446.png) But I can if I size it up by 2x with no interpolation: ![stresstest-only-120dpi-expanded](https://user-images.githubusercontent.com/2281400/80309562-d3bcb480-87a3-11ea-933f-0ef0fa305414.png)

First attempt at supporting multithreading for https://github.com/piderman314/bardecoder/issues/3 using a feature called "multithreaded". Currently hardcoded at 4 threads - not sure how this would be best configured.

These seem to be getting more popular by the day.