Rename mod object->obj

Also, object.rs got moved to a new directory in preparation for
splitting members out into their own files

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

src/compile.rs

@@ -1,4 +1,4 @@
-use crate::object::*;
+use crate::obj::*;
 use crate::scope::*;
 use crate::syn::ast::*;
 use crate::vm::inst::*;