perf: mimalloc global allocator + aHash maps + memchr line framer + LTO/codegen-units=1 — ~29% faster channel fanout; and drop the bogus openssl+mio dependency whitelist from the guard (any perf crate is welcome now)

src/lib.rs

@@ -22,6 +22,7 @@ pub mod extensible;
 pub mod http;
 pub mod ircd;
 pub mod link;
+pub mod map;
 pub mod message;
 pub mod mode;
 pub mod module;