FTGP-140: Refactoring of the API error types
Changed all assembly company name and copyright to Företagsplatsen AB (some of them was for example MSC Konsult and Microsoft).
FTGP-181, FTGP-180, started on FTGP-170 and some formating clean up of the code
Removed unnecessary resharper comment and code formating
FTGP-179: SieImport resource
FTGP-170: Document entities. Still room for a lot of improvement but it is release able
Added support for the old legacy ChartOfAccountType for the sie import in Api v1.0 (BL needs it)