v1.7.0 to fix the blocking issue in loop()

### Major Release v1.7.0

1. Fix ESP8266 bug not easy to connect to Config Portal for ESP8266 core v3.0.0+ 
2. Fix the blocking issue in loop(). Check [retries block the main loop #18](khoih-prog/WiFiManager_NINA_Lite#18)
3. Configurable `WIFI_RECON_INTERVAL`. Check [retries block the main loop #18](khoih-prog/WiFiManager_NINA_Lite#18 (comment))
4. Optimize library code by using `reference-passing` instead of `value-passing`
5. Clean up

Author: khoih-prog

README.md

@@ -164,7 +164,7 @@ This [**ESPAsync_WiFiManager_Lite** library](https://github.com/khoih-prog/ESPAs
 
 ## Prerequisites
 
- 1. [`Arduino IDE 1.8.19+` for Arduino](https://www.arduino.cc/en/Main/Software)
+ 1. [`Arduino IDE 1.8.19+` for Arduino](https://github.com/arduino/Arduino). [![GitHub release](https://img.shields.io/github/release/arduino/Arduino.svg)](https://github.com/arduino/Arduino/releases/latest)
  2. [`ESP8266 Core 3.0.2+`](https://github.com/esp8266/Arduino) for ESP8266-based boards. [![Latest release](https://img.shields.io/github/release/esp8266/Arduino.svg)](https://github.com/esp8266/Arduino/releases/latest/). To use ESP8266 core 2.7.1+ for LittleFS.
  3. [`ESP32 Core 2.0.2+`](https://github.com/espressif/arduino-esp32) for ESP32-based boards. [![Latest release](https://img.shields.io/github/release/espressif/arduino-esp32.svg)](https://github.com/espressif/arduino-esp32/releases/latest/)
  4. [`ESPAsyncWebServer v1.2.3+`](https://github.com/me-no-dev/ESPAsyncWebServer) for all ESP32/ESP8266-based boards.