Get rid of unique header files for each encoder, consolidate them to
where they are actually needed: encoding.h.
This also simplifies the generation of the base64u decoder, as its
header file does not need to be generated any longer.
Signed-off-by: Ralf Ramsauer <ralf@ramses-pyramidenbau.de>
"Permission to use, copy, modify, and distribute this software" is now
"Permission to use, copy, modify, and/or distribute this software".
Add license header to source files missing one.