build: replace autotools with cmake

this patch removes all the autoconf/automake/libtool build
infrastructure and replaces it with cmake.

notable default behavior changes:
- man pages are not pre-built, and are not built by default, must be
  enabled with `-DBUILD_MANPAGES=ON`.

removed features:
- srpm packaging, to be reintroduced at some point.
- deb packaging, now handled externally via rafaelmartins/deb.rgm.io

more stuff must be missing, please report bugs!

1 files changed, 8 insertions, 0 deletions

diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..3eb825d
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,8 @@
+{
+    "files.associations": {
+        "*.sh.in": "shellscript"
+    },
+    "[shellscript]": {
+        "files.trimTrailingWhitespace": false
+    },
+}