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.
When I changed the library to not overwrite existing names [1], I wasn't
happy with how `FirstResultStringFormatter` was changing the results,
because the results should be completely ready by the time they arrive
in the formatters.
This commit changes that behaviour, ensuring the results are complete
with all necessary information by the time they reach the formatters.
Along with those changes, I refactored some stringifiers and simplified
the `InterpolationRenderer`; we were not overwriting the "name"
parameter anyway, as it was just an unnecessary overhead.
[1] 8332d28acc
