Modules are now created using `Module.new`, instead of manually creating
an object with its prototype set to `Module`. This in turn allows us to
store the module name and path in every created module.

Because methods on Module might conflict with user defined ones, the
name and file path are not exposed as methods directly. Instead, a
mirror can be used to retrieve this information. Since instance
attributes can not be defined in a module, the use of these in Module
will not conflict with anything.