Add QR scanner data collection

[jkleiber]

Summary
A normal QR scanner will just copypasta information into a text file. We should handle that in the batch uploader introduced in #78 by adding a "text" mode for the data input type (vs. the implicitly expected JSON mode).

The idea here is to create a JSON array of scanned data (JSON objects) and then process the data in CSV or upload mode as normal

Work Required

• Add a mode switch for text vs. json input
• Create JSON array from text data
• Pipe each input mode into the output modes