Merge #143

143: Implement Find All References and Rename for local variables r=matklad a=kjeremy

Expose `find_all_refs` in `Analysis`. This currently only works for local variables.

Use this in the LSP to implement find all references and rename.

Co-authored-by: Jeremy A. Kolb <jkolb@ara.com>

crates/ra_editor/src/scope/fn_scope.rs

@@ -270,7 +270,6 @@ pub fn resolve_local_name<'a>(
         .filter(|entry| shadowed.insert(entry.name()))
         .filter(|entry| entry.name() == name_ref.text())
         .nth(0);
-    eprintln!("ret = {:?}", ret);
     ret
 }