Rename Scope#properties to vars
Rename Scope#properties to vars

Calling it ".properties" is unnecessarily confusing, and a holdover from the JS-Interpreter days when, due to the global scope being the global object, scopes and objects needed to have the same structure.

NeilFraser/CodeCity,NeilFraser/CodeCity,google/CodeCity,google/CodeCity,NeilFraser/CodeCity,google/CodeCity,NeilFraser/CodeCity,google/CodeCity