Implement function pointers.

src/packages/fn_basic.rs

@@ -0,0 +1,8 @@
+use crate::def_package;
+use crate::fn_native::FnPtr;
+
+def_package!(crate:BasicFnPackage:"Basic Fn functions.", lib, {
+    lib.set_fn_1_mut("name", |f: &mut FnPtr| Ok(f.get_fn_name().clone()));
+    lib.set_getter_fn("name", |f: &mut FnPtr| Ok(f.get_fn_name().clone()));
+
+});