Add common data structures

This adds some common data structures and functions needed for RDE BEJ.

The decoder core is written in C so that we can use this with some other
future platforms.
clang-tidy is complaining about C style header. I tried adding a
.clang-tidy-ignore file but it did not work. And since this is mainly a
C library, I deleted the .clang-tidy.

Signed-off-by: Kasun Athukorala <kasunath@google.com>
Change-Id: Ice07527b23cd00c65cd11ed114ea4faefcc085fb
diff --git a/meson_options.txt b/meson_options.txt
new file mode 100644
index 0000000..0fc2767
--- /dev/null
+++ b/meson_options.txt
@@ -0,0 +1 @@
+option('tests', type: 'feature', description: 'Build tests')