optimize release binary sizes

Cargo.toml

@@ -2,4 +2,9 @@
 members = ["dit", "stardit", "libdit", "libstardit"]
 resolver = "2"
 
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+[profile.release]
+opt-level = "z"
+lto = true
+codegen-units = 1
+panic = "abort"
+strip = true