Simultanious AP and WiFi client mode

[maxpavlov]

It would have been perfect that for the cases where hardware allows it, rogueportal would work as AP and Wifi client simultaneously.

This repo talks about such a possibility on Raspberry Pi 3+ but with the use of hostapd which rogueportal ommits from using which I think is great.

Anyways, if you ever wonder what challenge to solve next - retaining wifi connection while "up"in the AP would be a sweet addition to the tool.