[#61223014] Copy in Excel workbook import code
[#61223014] Initial code for spreadsheet upload
[#61223014] Remove file IDs from List model
[#61223014] Simplify file upload/append validation schemas
[#61223014] Apply validation schema changes to views
[#61223014] Bypass sfile, retrieve spreadsheet file from url link
[#61223014] Remove sfile functionality from Workbook classes
[#61223014] Change Workbook calls in List class methods
[#61223014] Spawn import list task upon list remap
[#61223014] Port file_response method from sfile
[#61223014] Remove list append view, will add later with snapshots