WAD file format documentation

I finally found the time to collect some details on the file format, including the meaning of the "name" field and the compression algorithms used. At least I couldn't find those easily on the Internet, so here is all put together in a nice and compact post: https://thp.io/2020/pure-wad.html

Some additional documentation on the "name" field in the WAD files: https://thp.io/2020/wad-hash.html

Nice find ☺

stevie