Publishing my old invoice layouter in a reusable scripting-based form,
rather than an annoyingly fixed binary.
Because Lua compiled for C++ might be hard to find, we provide a wrap.
Curiously, only GitHub releases seem to contain onelua.c,
which is a very handy file.
We could have also subprojected libqr, which is in the public domain,
however the other main dependencies are also LGPL like libqrencode is.
And it is likely to be installed.
The user manual also serves as a test.
I've come to the conclusion that copyright mostly just stands in the way
of software development. In my jurisdiction I cannot give up my own
copyright and 0BSD seems to be the closest thing to public domain.
The updated mail address, also used in my author/committer lines,
is shorter and looks nicer. People rarely interact anyway.
