Importer: turn an xlsx into stoic's internal json format:
{
name: 'spreadsheetName'
timezone: '',
...
"sheets": {
"Fields": {
"values": [
[
"A1 ...",
"B1 ..."
],
},
"numberFormats": [
[ ]
],
"notes": [
[ "text of the comments on A1", "..." ]
],
}
}
Exporter: turn an xlsx into