Add ESP32-WROOM-32U
During https://github.com/KiCad/kicad-symbols/pull/724, the ESP32-WROOM-32U was excluded because it couldn't be an alias of ESP32-WROOM-32 since it needs a different footprint despite being the same symbol (https://github.com/KiCad/kicad-symbols/pull/724#issuecomment-408981070).
Copied from the ESP32-WROOM-32 symbol. Only changes are: - Name - Description and datasheet - Default footprint - Footprint filter - Keywords
Also, after adding ESP32-WROOM-32U which needs an external antenna, I've added a second commit to make clear that ESP32-WROOM-32 and ESP32-WROOM-32D have an onboard PCB antenna.
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Provide a URL to a datasheet for the symbol(s) you are contributing -
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