Rename "Local" to "Name" when referring to variables during compilation

* Variables were previously named "Local"s because they described a
  local variable - however, this is kind of a misnomer because it
  handles globals as well. This has been changed pretty much everywhere
  when appropriate (hopefully).
* Renamed obj/names.rs to obj/reserved.rs, freeing up the "names" module
  for the new Names handle
* Renamed obj/locals.rs to obj/names.rs, see above

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

src/obj/fun.rs

@@ -1,4 +1,4 @@
-use crate::{obj::{names::*, prelude::*}, vm::{inst::Inst, Vm}};
+use crate::{obj::{reserved::*, prelude::*}, vm::{inst::Inst, Vm}};
 use once_cell::sync::Lazy;
 use shredder::{GcSafeWrapper, Scan};
 use std::fmt::{Debug, Formatter, self};
@@ -44,7 +44,7 @@ pub struct UserFun {
     code: Vec<Inst>,
     // Safe because this is just an interner that points to symbols, which aren't GC'd
     #[shredder(unsafe_skip)]
-    locals: Locals,
+    locals: Names,
 }
 
 impl UserFun {
@@ -52,7 +52,7 @@ impl UserFun {
         &self.code
     }
 
-    pub fn locals(&self) -> &Locals {
+    pub fn locals(&self) -> &Names {
         &self.locals
     }
 }