Uploader to accession image gallery

Implement a GUI tool that reads the spreadsheet containing image meta-data and pushes the local images to the Genesys server using the galleries REST API. The spreadsheet may contain URLs to publicly accessible websites or relativePaths to images.

When relativePath is used, the user is able to select the "base" folder where images are located and the uploader tool will send the image bytes over the network. In case of URLs, the image data will be retrieved by Genesys, the tool only needs to check if the URL returns HTTP 200 OK status.