[v1] Support I2C Output Components

[brentru]

Backport of commits within #133 for api-v1

Resolves: #143

[brentru]

@lorennorman Please hold off reviewing this until I can provide you with details about how this is implemented. Thanks!

[brentru]

@lorennorman This is ready for review.

The only thing that I did not address is I2CDeviceOutputWrite's output_msg field. I'm uncertain if future I2C output devices that we will support might require message types beyond strings, or if we'll need to include additional parameters with the message (such as delimiter options, font options, font size options, or backlight color settings).

[brentru]

This decision also makes sense as ladyada mentioned she wants backlight LED control for the character LCD (LED backlight “feed” for character LCD disable/enable (0 and 1))

[lorennorman]

💯 looks great, will be perfect once the capitalizations are tweaked for consistency

[brentru]

@lorennorman I've addressed the review comment. Is it safe to merge this in, or should we leave this for here as this'll initially sit on staging?

[lorennorman]

i think you can merge away!

[brentru]

Will merge after SSD1306 is implemented and tested on hardware!

[brentru]

adafruit/Adafruit_Wippersnapper_Arduino#751 looks good, merging this!