Add Wifi filtering options to IRMQTTServer. (#679)
Add Wifi filtering options to IRMQTTServer. (#679)

- Add the ability to filter on Wifi signal strength.
- Show all Wifi networks in WifiManager config interface. (configurable)
  * Should allow users to select the AP/SSID they want when there are duplicates.
- Block Serial debug output if we know a IR gpio is using the Serial TX Gpio.
- Reorder and group up configuration options into logical sections.
- Add details to the /info page.

Limited testing on my personal device. i.e. Things still work. Debug disables when it should.

For #645
Fixes #646
markszabo/IRremoteESP8266,markszabo/IRremoteESP8266,markszabo/IRremoteESP8266,markszabo/IRremoteESP8266