Add drag-and-drop file import and multi-format template export to OasisSubmitter#1895

Mbeaulne wants to merge 1 commit into03-04-bulk_argument_upload_-_yamlTangleML/tangle-ui:03-04-bulk_argument_upload_-_yamlfrom

03-04-bulk_argument_upload_-_template_selectionTangleML/tangle-ui:03-04-bulk_argument_upload_-_template_selectionCopy head branch name to clipboard