Implement ftdi led device - 2

[Lord-Grey]

Summary

This PR reflects @nurikk / @nurikk-sa ftdi development without the jointup of the SPI and ftdi device code (see #1595).

The PR introduces ftdilib1 led device implementation. FTDI chips are common usb2serial/spi/whatever chips, and are available for 5-10$ from Chinese website as various breakout boards.

My wiring is following:

FTDI  |  APA102 
AD0 -> CLOCK
AD1 -> DATA

AD3 -> CS (active low) // can be used to drive logic shifter OE pins


FTDI  |  WS2812 or SK6812
AD1 -> DATA

AD3 -> CS (active low) // can be used to drive logic shifter OE pins

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• Code style update
• Refactor
• Docs
• Build-related changes
• Other, please describe:

If changing the UI of web configuration, please provide the before/after screenshot:

Does this PR introduce a breaking change? (check one)

• Yes
• No

If yes, please describe the impact and migration path for existing setups:

The PR fulfills these requirements:

• When resolving a specific issue, it's referenced in the PR's body (e.g. Fixes: #xxx[,#xxx], where "xxx" is the issue number)

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature
• Related documents have been updated (docs/docs/en)
• Related tests have been updated

PLEASE DON'T FORGET TO ADD YOUR CHANGES TO CHANGELOG.MD

• Yes, CHANGELOG.md is also updated

To avoid wasting your time, it's best to open a feature request issue first and wait for approval before working on it.

Other information:

[nurikk]

Terrific! I'm glad that this will get to upstream! 👍

[Lord-Grey]

@nurikk Please have a look, if you would like to add something.
Otherwise, I will merge with the master.