OTA support over WiFi AP

[icapurro]

Steps to do an update over OTA:

1. Connect to the shotStopper via BLE
2. Turn on otaModeRequest by setting the BLE characteristic to true
3. Wait for the wifi AP and http server to start (this will stop the rest of the shotStopper functions)
4. Connect over wifi to the shotStopperAP wifi
5. Upload your .bin over http:

curl -X POST http://192.168.4.1/update \
     -H "Content-Type: multipart/form-data" \
     -F "update=@shotStopper.ino.bin"