Improve RGB LED functionality

[techfoundrynz]

1. Add wait to led update to prevent partial strip updates
2. Pull old pin low when calling init with different pin to avoid floating/high state potentially causing flickering leds on multi-pin setups

Maintains compatibility with any existing lisp scripts

[vedderb]

Feel free to get rid of this argument and led_type_driver. They are not used since I moved the RGB order into the LED buffer.

[vedderb]

I'm happy to merge this one if it works well for you. At the moment I don't have any setup with RGB LEDs and it looks like you have more experience with them than I do.

[techfoundrynz]

I'm happy to merge this one if it works well for you. At the moment I don't have any setup with RGB LEDs and it looks like you have more experience with them than I do.

Thanks, appreciate it. I'm going to do some more a/b tests with large strips on multiple pins over the weekend and will publish the PR once I'm happy with the results.

[vedderb]

Any update on this one? The changes look very useful and I'm happy to test and merge them.