Organize .gitignore by moving all patterns into a top level sorted
.gitignore file. With this change both "git status" and
"git-ls-ignore-index" should return cleanly. The later checks if any
files in the index are ignored.
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`manual.adoc` contains Freedoom’s manual. It is intended to be built
as a PDF file but can also be viewed in HTML format. To build as a
PDF, https://asciidoctor.org/[Asciidoctor] is required, since it has
superior PDF output to the Asciidoc reference implementation.
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