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/vm/frame.rs

@@ -26,20 +26,20 @@ unsafe impl GcSafe for FrameKind {}
 
 #[derive(Scan, Debug, Clone)]
 pub struct Frame {
-    locals: Locals,
+    locals: Names,
     kind: FrameKind,
 }
 
 impl Frame {
-    pub fn new(locals: Locals, kind: FrameKind) -> Self {
+    pub fn new(locals: Names, kind: FrameKind) -> Self {
         Self { locals, kind, }
     }
 
-    pub fn locals(&self) -> &Locals {
+    pub fn locals(&self) -> &Names {
         &self.locals
     }
 
-    pub fn locals_mut(&mut self) -> &mut Locals {
+    pub fn locals_mut(&mut self) -> &mut Names {
         &mut self.locals
     }