This commit introduces REUSE compliance by annotating all files
with SPDX information and placing the reused licences in the
LICENSES folder.
We additionally removed the docheader tool which is made obsolete
by this change.
The main LICENSE and copyright text of the project is now not under
my personal name anymore, and it belongs to "The Respect Project
Contributors" instead.
This change restores author names to several files, giving the
appropriate attribution for contributions.
Currently, the only way to handle when a validation fails is by
`assert()`, which either throws an exception or doesn't. That means that
every time a user wants to handle the results, they must use try-catch
blocks, which may add some overhead.
This commit introduces the `ResultQuery` class that wraps a `Result`
object, providing an alternative to exception-based validation. This
allows users to handle results directly without try-catch blocks.
I’m taking a risky move here using the old method `validate()`, but I
can’t think of a better name for this method.
