Add WS2812B-2020 (Adafruit/Worldsemi NeoPixel Nano 2020 RGB LED)

I added a footprint for NeoPixel Nano 2020 RGB LED WS2812B (WS2812B-2020).

Web pages listing the component from two different manufacturers (Worldsemi, Adafruit: maybe just rebranded?) seem compatible with each other:

• https://www.adafruit.com/product/4684
• http://www.world-semi.com/DownLoadFile/140
  • https://jlcpcb.com/partdetail/Worldsemi-WS2812B2020/C965555
  • http://www.world-semi.com/solution/list-4-1.html

There seems to be another LED with the same physical properties and the same footprint, only slightly different operating current and luminosity, WS2012C-2020:

• http://www.world-semi.com/DownLoadFile/139

Questions

Questions where I need your help:

• Naming: I derived the name from LED_WS2812B_PLCC4_5.0x5.0mm_P3.2mm and named this one LED_WS2812B_PLCC4_2.0x2.0mm_P1.0mm. Maybe it should be called WS2812B-2020 instead of just WS2812B to make it immediately more clear that this represents the 2x2mm packaging. The schematic can remain the same as for WS2812B_PLCC4 (I can make a merge request for a specialized schematic referencing the 2020 variant once this gets accepted).
• How wide should the line on the silkscreen be? As wide as the courtyard or as wide as the LED?
• I started from the existing footprint for WS2812B, but I'm not sure how to properly mark the orientation on the silkscreen. I added a dot for pin 1 and a black strip/rectangle that matches the strip that's drawn on the actual LED (I just had to do it 0,15 mm away from the closest pad). Below is also the footprint from EasyEDA for comparison.
• I suspect that the led needs to be rotated by 90 degrees to match the reel packaging.

Footprint with dimensions

I made the courtyard go at least 0,25 mm from the pad and the housing of the LED. On the side it's 0,255 mm away because the pads had to be centred with 0,005 mm precision to fully match the dimensions from the datasheet.

Dimensions from the datasheet