build: Convert project to meson and C++20

Cleanedup all build warnings and updated the header to point to the
latest ipmid.

Change-Id: Ife89b51cda0137c8632fc24525efc131817e07b8
Signed-off-by: Willy Tu <wltu@google.com>
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..3ba4350
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+# Meson
+/build*/
+/subprojects/*/