Scripts/EloinstToGit: Replace GUID, DOCDATE, DOCDATEISO and SREG from es8 file with default values
- this improves developer experience
- without this change everytime a developer pulls from elo (after doing a push) ALL Guids are changed
- this leads to hundreds or even thousands of filechanges in git diff viewer
- we replace all changing attributes with a default value
- this has been tested almost 1 year long with elo 20 and elo 23 and did not lead to any problems