Merge arbiter and channel into sync

rtic-sync/src/lib.rs

@@ -0,0 +1,12 @@
+//! Synchronization primitives for asynchronous contexts.
+
+#![no_std]
+#![deny(missing_docs)]
+//deny_warnings_placeholder_for_ci
+
+pub mod arbiter;
+pub mod channel;
+
+#[cfg(test)]
+#[macro_use]
+extern crate std;