If a file called `.ci.defines` is present in a directory, apply those
while building the specified sketch.
* Add an lwip_ESPHost test, like the wired Ethernet ones
* Add WINC1500 test and CI hook
* Remove 1 minor warning in WINC build
WiFiMulti specifies a specific BSSID, in addition to the AP name and
password. In the WiFi core the BSSID is stored as the raw 6-byte MAC
address, but the ESPHostedFG firmware expects a formatted C-String
(i.e. "ab💿ef:01:02:03" instead of {0xab, 0xcd, 0xef, 1, 2, 3})
Convert the raw bytes to the string format expected in the ESP FW.
