Support for multiple inheritance

[t6d]

SmartProperties now allows modules to define properties just like classes do and ensures that all properties are eventually included into the target class. Multiple inheritance was previously not supported or required custom included hooks.

module PII
  include SmartProperties
  property! :name, accepts: String
  property! :email, accepts: String
end

module Job
  property! :title, accepts: String
  property! :company, accepts: String
end

class Person
  include PII
  include Job
end