* complete read invoices from db
* wip
* wip
* wip
* wip
* wip
* wip
* wip
* wip
* updated nuget package spapi
* WIP
* wip, now test
* wip, jut need to fix tax inclusive line amounts not supported
* wip
* wip, before I f everything up
* no, it complies now, this is the one before I f everything up
* wip
* wip
* wip, logic ready for testing
* wip it builds!!!!
* wip tested, working, need to complete the gui section
* wip
* wip
* wip - created export invoice data delete, time for testing
* wip testing phase
* wip - delete function fully tested and working
* wip on to sorting out the issue with settlement invoices not tallying
* wip
* wip
* wip
* wip
* wip before I complete change the ReadInvoiceLineItem sections
* that appears to have worked, on with the main quest
* no it's doesn't work, saving before i remove the confusing cache system (just use a dictionary!!)
* wipping picadilli
* wip
* wip
* implemented uow on inovice export, now for testing
* wip
* wip all tested do invoice currency convertion fearure
* wip
* pretty much done so long as xero accepts the exported invoices
* Complete!
