Add Multiple Feeds for Output Components

[brentru]

While WipperSnapper's input-type components may create multiple feeds, output-type components (LEDs, displays) are unable to create multiple feeds.

This will be useful for the following components:

• RGB LED Component - This one component should produce three feeds, one holding the value of the color channel
• Character LCD Display Component with RGB Backlights - This one component should be able to produce two feeds: message data, and color data
• Buzzer Component - Frequency could be an extra feed produced by the component

cc @ladyada