* Add code_scan_listener package
* Implement wedge controller widget
* Update barcode settings widget
- Allow user to choose which barcode scanner to use
* Fix typo
* Select barcode scanner widget based on user preference
* Fix rendering issues for wedge controller
* Update release notes
* Add unit test for wedge scanner widget
- Required some tweaks to other code
* Use better library
- https://github.com/fuadreza/flutter_barcode_listener
- Fork of https://github.com/shaxxx/flutter_barcode_listener
- Properly handles key "case" issues (shift, essentially)
- Verified that it works correctly for multiple character types
* Local copy of code, rather than relying on package which is not available on pub.dev
* Fix unit test
