Introduces a Markdown linter for checking the Changelog format.
"See Also" was transformed into a section to make it easier to
handle it with the `Content` class. The "Related" linter was
simplified to reflect that change too.
An additional "alignment" parameter was added to markdown table
generators, allowing the padding and headers to be explicitly
marked with a specific left (-1), middle (0) or right(1)
alignment.
Existing files were fixed using the `fix` option after the
changes.
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.
There's more value on showing how `assert()` displays the validation
messages than simply showing if `isValid()` returns `true` or `false`.
However, that increases the chances of having outdated documentation, so
I created a doc linter that updates the Markdown files with the
correct message.
