Adds species_drop FFI method.

src/ffi/static_data/species.rs

@@ -3,6 +3,7 @@ use crate::static_data::{Form, Species};
 use crate::StringKey;
 use hashbrown::HashSet;
 use std::ffi::{c_char, CStr};
+use std::ptr::drop_in_place;
 use std::sync::Arc;
 
 #[no_mangle]
@@ -35,6 +36,11 @@ unsafe extern "C" fn species_new(
     )))
 }
 
+#[no_mangle]
+unsafe extern "C" fn species_drop(ptr: OwnedPtr<Species>) {
+    drop_in_place(ptr);
+}
+
 ffi_getter!(Species, id, u16);
 ffi_stringkey_getter!(Species, name);
 ffi_getter!(Species, gender_rate, f32);