[Feature Request] Continuous Scan Mode

[david-kalbermatten]

Is your feature request related to a problem? Please describe.
I'm building a contact tracing app that uses barcodes (hence why I'm here :D). The issue I'm facing is my need to use the scanner continuously.

Describe the solution you'd like
I'd like there to be an option where the scanner can be opened and used continuously i.e. without closing the scanner in between scans.

Describe alternatives you've considered
Right now, I'm closing and opening the scanner and reopen it after each scan.

Additional context
Another thing I noticed is the scanner not invoking a wakelock to keep the screen on while scanning. I don't know whether or not this deserves a separate issue/feature request. I can kind of circumvent the issue right for now, since the scanner closes every so often and re-engages the wakelock, however, if you consider adding the continuous mode you'd have to also address the wakelock issue.

[devtronic]

Dupe of #147