Dividing LEDs into different groups

[LarryD]

@michi160200

I'd like to let the first and the last LED blink while the others use the animation

• leds[NUM_LEDS] we assume you know this array is where the pixel state (colour) is stored.

• Element 0 and NUM_LEDS - 1 are the 1st and last pixels.

• These can be updated as you need in your sketch.