Add a `CommandKit::Options::Type` base class

[postmodern]

Add a CommandKit::Options::Type base class to make it easier to define custom OptionParser.accept types.

Example

class CustomType < CommandKit::Options::Type

  usage 'CUSTOM'
  
  pattern /.../
  
  def self.parse(value)
    # ...
  end
  
end

Options::Types.register CustomType

The register method would simply call OptionParser.accept and populate the USAGE Hash:

OptionParser.accept(type, type.pattern, &type.method(:parse))