Optionally indicate scan-readiness in title

Some models of RFID scanner queue up multiple scans and feed them out to the browser using the title string as an indication that the web application continues to be ready to receive input. In order to facilitate this, we could add a prefix to the title to indicate when the item barcode field has focus.

Approach: we can use the build-time configuration in the tenant's stripes.config.js to set the title prefix to use, if any, and apply it via react-titled. This will have no effect for any tenant not configured with a prefix.