Investigate converting into Electron-based application

[markfullmer]

There is a well-supported port of the Tesseract OCR engine at https://tesseract.projectnaptha.com/

Combined with using the application framework https://www.electronjs.org/, this could provide a path forward for creating a library-independent build of this project -- up till now, the problem has been reliance on the Tesseract C++ library.