Multiple updates, additions & improvements

[Onno-Dirkzwager]

Update

• the hardcoded PROGMEM certificate
• the hardcoded Fingerprint
• Example: IASLoader added hardcoded certificate for faster setup by user

Additions

• Timeout for configmode after X time of inactivity (lost with past pullrequests...)
• Example: BatchLoader
• bool IAS.WiFiConnected so users can check and or tell the library if the device is connected to WiFi
• Preset: IAS.preSetConnWifiOnBoot(false) to prevent the library from setting up WiFi on boot.

Improved

• WiFiConnect & Disconnect
• WiFi: Don't try to connect if no creds. (thanks dd_weber)
• NTP time sync routine. Continu to boot if the initial sync failed. And try again later when needed: Callhome & Configmode
• setclock to UTC by default & add defines in config.h for timezone, offset and servers #131
• Configmode
  • also send announcements to IAS servers when using the config from local SPIFFS storage
  • Add workaround to prevent ESP32 reboots when connecting in AP mode #168