Add 0805 RGB LEDs

0805 RGB LEDs as specified in https://www.we-online.com/components/products/datasheet/150080M153000.pdf and https://www.mouser.de/datasheet/2/244/SML-LXT0805SIUGUBW-1776540.pdf

I have chosen to use a PIN1 marker similar to LED_RGB_1210, and not match the markings on the Würth component (which would make Würth parts easier to install but not other, compatible parts) I have now created two different footprints, each with orientation markers aiming to resemble these on the part, but not indicate pin1 position.