Migrated from uom to custom quantity implementation.

src/lib.rs

@@ -1,4 +1,4 @@
-#![no_std]
+#![cfg_attr(not(feature = "std"), no_std)]
 
 pub mod transducer;
 pub mod control;
@@ -7,5 +7,6 @@ pub mod error;
 pub mod adc;
 pub mod uom;
 pub mod circuit;
+pub mod quantity;
 
 pub use error::CriticalError;