Use multiple renames to simplify plugins.

src/packages/string_more.rs

@@ -140,6 +140,7 @@ mod string_functions {
     pub fn add_prepend_unit(_x: (), s: ImmutableString) -> ImmutableString {
         s
     }
+
     #[rhai_fn(name = "+=")]
     #[inline(always)]
     pub fn append_char(s: &mut ImmutableString, ch: char) {
@@ -151,17 +152,12 @@ mod string_functions {
         *s += &add;
     }
 
+    #[rhai_fn(name = "len", get = "len")]
     #[inline(always)]
     pub fn len(s: &mut ImmutableString) -> INT {
         s.chars().count() as INT
     }
 
-    #[rhai_fn(get = "len")]
-    #[inline(always)]
-    pub fn len_prop(s: &mut ImmutableString) -> INT {
-        len(s)
-    }
-
     #[inline(always)]
     pub fn clear(s: &mut ImmutableString) {
         s.make_mut().clear();