Switch to using hashbrown version of HashMap and (#2158)

HashSet for improved performance and memory usage

src/lib.rs

@@ -77,6 +77,7 @@ pub mod window_service;
 #[cfg(any(feature = "chacha", feature = "cuda"))]
 #[macro_use]
 extern crate hex_literal;
+extern crate hashbrown;
 
 #[macro_use]
 extern crate log;