- Updated license headers in update_license_headers.py script

- Updated license headers in update_license_headers.py script

- Updated file mode update in update_license_headers.py script

- Updated file mode update in update_license_headers.py script

- Added missing skip patterns
- Added multiple old copyright lines
- Added logic to keep new-line chars
- Not finished

- Corrected regular experssions
- Not finished

- Code cleanup
- Not finished

- Updated copyright line

- Updated copyright line
- Updated ignore filters

- Updated skip filters

Resolve "Update license headers for Release 3"

See merge request !224