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Disable WiFi power savings for more responsiveness #713

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tschundler
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I had lots of latency issues with the web interface and bCNC over port 23. I still have issues with bCNC, but this seems to have helped.

before:

$ ping 192.168.1.17
PING 192.168.1.17 (192.168.1.17) 56(84) bytes of data.
64 bytes from 192.168.1.17: icmp_seq=1 ttl=255 time=82.1 ms
64 bytes from 192.168.1.17: icmp_seq=3 ttl=255 time=81.0 ms
64 bytes from 192.168.1.17: icmp_seq=5 ttl=255 time=1410 ms
64 bytes from 192.168.1.17: icmp_seq=6 ttl=255 time=386 ms

after:

$ ping 192.168.1.17
PING 192.168.1.17 (192.168.1.17) 56(84) bytes of data.
64 bytes from 192.168.1.17: icmp_seq=1 ttl=255 time=159 ms
64 bytes from 192.168.1.17: icmp_seq=2 ttl=255 time=9.77 ms
64 bytes from 192.168.1.17: icmp_seq=3 ttl=255 time=5.81 ms
64 bytes from 192.168.1.17: icmp_seq=4 ttl=255 time=48.0 ms
64 bytes from 192.168.1.17: icmp_seq=5 ttl=255 time=6.70 ms
64 bytes from 192.168.1.17: icmp_seq=6 ttl=255 time=6.36 ms

see also: espressif/arduino-esp32#1484

before:
```
$ ping 192.168.1.17
PING 192.168.1.17 (192.168.1.17) 56(84) bytes of data.
64 bytes from 192.168.1.17: icmp_seq=1 ttl=255 time=82.1 ms
64 bytes from 192.168.1.17: icmp_seq=3 ttl=255 time=81.0 ms
64 bytes from 192.168.1.17: icmp_seq=5 ttl=255 time=1410 ms
64 bytes from 192.168.1.17: icmp_seq=6 ttl=255 time=386 ms
```

after:
```
$ ping 192.168.1.17
PING 192.168.1.17 (192.168.1.17) 56(84) bytes of data.
64 bytes from 192.168.1.17: icmp_seq=1 ttl=255 time=159 ms
64 bytes from 192.168.1.17: icmp_seq=2 ttl=255 time=9.77 ms
64 bytes from 192.168.1.17: icmp_seq=3 ttl=255 time=5.81 ms
64 bytes from 192.168.1.17: icmp_seq=4 ttl=255 time=48.0 ms
64 bytes from 192.168.1.17: icmp_seq=5 ttl=255 time=6.70 ms
64 bytes from 192.168.1.17: icmp_seq=6 ttl=255 time=6.36 ms
```

see also: espressif/arduino-esp32#1484
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