Fix Jard is bypassed when writting something to stdout while debugging

[0x2c7]

Scenario

    a = "Hello" * 20

    jard
    puts "Hello"
    puts "WTF is going on?"

    b = 1..20

Explanation

Internally, Ruby Jard overrides STDOUT#write method to append all the output to a buffer, and print it out after the program exits.

      def $stdout.write(string)
        # NOTE: `RubyJard::ScreenManager.instance` is a must. Jard doesn't work well with delegator
        if !RubyJard::ScreenManager.instance.updating? && RubyJard::ScreenManager.instance.started?
          RubyJard::ScreenManager.instance.output_storage.write(string)
        end
        super
      end

In the source code:

    class << self
      extend Forwardable

      def_delegators :instance, :update, :draw_error, :started?, :updating?

      def instance
        @instance ||= new
      end
    end

It turns out Byebug doesn't work well with delegators. Fixing the root cause is not easy. I'll work with byebug later.