Add ability to take a screenshot of barcode with the device's camera

[bhattibytes]

Is your feature request related to a problem? Please describe.
Yes, there is an open issue namely this one: #891
Adding the ability for the camera to take a screenshot of the image then use it in the upload image option to extract the encoded text from the barcode instead of relying on the scanner to detect the barcode during the scan operation.

Describe the solution you'd like
Add a second button "Capture Manually" when in scanning mode to screen shot the image then use that in the image upload option which always works for any type of barcode.

Describe alternatives you've considered
Add support for scanning other types of barcodes e.g. PDF_417 ones