I ran the `bin/console spdx --fix` with different strategies for
different files. For most of the core classes, since they've been
drastically rebuilt, I've run it with the `git-blame` strategy, for for
the `src/Validators`, in which the API changed completely but the logic
remains the same, I use the `git-log` strategy.
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.
This commit concludes the effort to make all current validators
serializable by fixing the remaining ones.
The ability to use `finfo` instances on some filesystem validators
was removed. `Image` was refactored to be a readonly class.
A command was added to the main `composer qa` flow that checks
if all validators are covered by smoke tests (which are currently
used by benchmarks and serialization tests). Therefore, this commit
also ensures that every validator has a benchmark.
