As many open source projects have started doing it, we're removing the
current year from the copyright notice, so that we don't need to bump
it every year.
It seems like only the first year of publication is technically
relevant for copyright notices, and even that seems to be something
that many companies stopped listing altogether (in a version controlled
codebase, the commits are a much better source of date of publication
than a hardcoded copyright statement).
We also now list Godot Engine contributors first as we're collectively
the current maintainers of the project, and we clarify that the
"exclusive" copyright of the co-founders covers the timespan before
opensourcing (their further contributions are included as part of Godot
Engine contributors).
Also fixed "cf." Frenchism - it's meant as "refer to / see".
The Zipfile Reference should be set to `NULL` when the `ZIPPacker` is closed not when a file in it is closed.
When calling `ZIPPacker.close` without this nothing happens because `zf` is `NULL`. (7zip could still extract the file but warned about unexpected end of file.)
This check was removed because it introduces a bug which prevents
ZIPPacker from actually adding any files, since it must be opened before
adding any files (and therefore shouldn't be NULL at the start of
`start_file`).
