v1.5.0 to enable scan of WiFi networks

### Major Releases v1.5.0

1. Enable scan of WiFi networks for selection in Configuration Portal. Check [PR for v1.3.0 - Enable scan of WiFi networks #10](khoih-prog/WiFiManager_NINA_Lite#10). Now you can select optional **SCAN_WIFI_NETWORKS**, **MANUAL_SSID_INPUT_ALLOWED** to be able to manually input SSID, not only from a scanned SSID lists and **MAX_SSID_IN_LIST** (from 2-15)
2. Fix invalid "blank" Config Data treated as Valid.
3. Permit optionally inputting one set of WiFi SSID/PWD by using `REQUIRE_ONE_SET_SSID_PW == true`
4. Enforce WiFi PWD minimum length of 8 chars
5. Minor enhancement to not display garbage when data is invalid

Author: khoih-prog

README.md

@@ -187,7 +187,7 @@ For more information, check [Blynk WiFiManager for ESP8266/ESP32 (including ESP3
 
 #### Currently supported Boards
 
-This [**BlynkESP32_BT_WF** library](https://github.com/khoih-prog/BlynkESP32_BT_WF) currently supports these following boards:
+This [**Blynk_Async_WM** library](https://github.com/khoih-prog/Blynk_Async_WM) currently supports these following boards:
 
  1. **ESP8266 and ESP32-based boards using EEPROM, SPIFFS or LittleFS**.
  2. **ESP32-S2 (ESP32-S2 Saola, AI-Thinker ESP-12K, etc.) using EEPROM, SPIFFS or LittleFS**.