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".
"less" should be used for quantity, rather than "lesser".
Existing scripts that use `or_lesser` in `_get_property_list()`
will need to be updated to account for this change.
The inspector now supports converting degrees to radians automatically when
using the `radians` hint, so all those utility bindings were redundant.
This cleans things up by making these properties with slash properly bound
to `set_param`/`get_param` which the users can call with the relevant enum.
This is a legacy of Godot 2 days before the inspector had support for groups.
"Properties" with a slash in their name can't be accessed from script unless
using `set()`/`get()` so they were not actual properties as far as script
languages are concerned.
Part of #17558.
