Add support for Olimex ESP32-GATEWAY

[bikerglen]

I added Ethernet support for the Olimex ESP32-GATEWAY board. I tested this with a RevG version of that board. The only difference between the ESP32-POE board and the ESP32-GATEWAY board is the PHY power pin. It's on pin 12 of the PoE board and pin 5 on the gateway board. I used npm to rebuild the html header files and checked those into this commit / pull request since the settings_wifi.htm file was modified to include the ESP32-GATEWAY option.

[bikerglen]

And of course I have a typo in the commit message. Should be Olimex rather than Olixex.

[blazoncek]

Thanks, but please remove all unnecessary files modified by npm.

[bikerglen]

If I understand correctly, you would like me to keep wled00/html_settings.h in the commit and pull request since that's required to add ESP32_GATEWAY to the html wifi settings page but remove the rest of the html_*.h files from the commit and pull request. Is that correct?

[blazoncek]

Yes.

[bikerglen]

Should be done now.

[blazoncek]

Please, do not force-push changes next time. Do a normal commit and push.

[bikerglen]

I don't do a lot of complex git tasks. Will what I've done work or should I delete my fork and pull request and start over?

[blazoncek]

It will work, just don't force push in the future.

[blazoncek]

https://github.com/Aircoookie/WLED/wiki/How-to-properly-submit-a-PR

[blazoncek]

Hi. Could you re-base this PR for 0_15 branch and then we can merge it?