Squashed 'libs/cli11/' content from commit dcbcb47

git-subtree-dir: libs/cli11
git-subtree-split: dcbcb4721dda5dab0a56d9faaaee50e6a30f7758

.gitignore

@@ -0,0 +1,15 @@
+a.out*
+*.swp
+/*build*
+/test_package/build
+/Makefile
+/CMakeFiles/*
+/cmake_install.cmake
+/*.kdev4
+/html/*
+!/meson.build
+
+/node_modules/*
+/package.json
+/yarn.lock
+/CLI11.hpp