Add ability to set maximum drawer width

Ah - to define these in a module you'd have to do some module goodness.

```ruby
module ProMotion; module Menu
  module Visibility
    def self.included(base)
      base.class_eval do
        alias_method :max_left_width, :maximumLeftDrawerWidth
      end
    end
  end
end; end
```

Didn't test that out @ryanlntn, but I think that is what is needed here.