Factory reset feature (#114)

Implemented factory-reset feature
Extract factory settings into separate ini file
Hide reset/factory reset from guest user

Co-authored-by: kasedy <kasedy@gmail.com>

factory_settings.ini

@@ -0,0 +1,44 @@
+[factory_settings]
+build_flags = 
+    ; WiFi settings
+    -D FACTORY_WIFI_SSID=\"\"
+    -D FACTORY_WIFI_PASSWORD=\"\"
+    -D FACTORY_WIFI_HOSTNAME=\"esp-react\"
+
+    ; Access point settings
+    -D FACTORY_AP_SSID=\"ESP8266-React\"
+    -D FACTORY_AP_PASSWORD=\"esp-react\"
+    -D FACTORY_AP_PROVISION_MODE=AP_MODE_DISCONNECTED
+
+    ; User credentials for admin and guest user
+    -D FACTORY_ADMIN_USERNAME=\"admin\"
+    -D FACTORY_ADMIN_PASSWORD=\"admin\"
+    -D FACTORY_GUEST_USERNAME=\"guest\"
+    -D FACTORY_GUEST_PASSWORD=\"guest\"
+
+    ; NTP settings
+    -D FACTORY_NTP_ENABLED=true
+    -D FACTORY_NTP_TIME_ZONE_LABEL=\"Europe/London\"
+    -D FACTORY_NTP_TIME_ZONE_FORMAT=\"GMT0BST,M3.5.0/1,M10.5.0\"
+    -D FACTORY_NTP_SERVER=\"time.google.com\"
+
+    ; OTA settings
+    -D FACTORY_OTA_PORT=8266
+    -D FACTORY_OTA_PASSWORD=\"esp-react\"
+    -D FACTORY_OTA_ENABLED=true
+
+    ; MQTT settings
+    -D FACTORY_MQTT_ENABLED=false
+    -D FACTORY_MQTT_HOST=\"test.mosquitto.org\"
+    -D FACTORY_MQTT_PORT=1883
+    -D FACTORY_MQTT_USERNAME=\"\"
+    -D FACTORY_MQTT_PASSWORD=\"\"
+    ; if unspecified the devices hardware ID will be used
+    ;-D FACTORY_MQTT_CLIENT_ID=\"esp-react\"
+    -D FACTORY_MQTT_KEEP_ALIVE=16
+    -D FACTORY_MQTT_CLEAN_SESSION=true
+    -D FACTORY_MQTT_MAX_TOPIC_LENGTH=128
+
+    ; JWT Secret
+    ; if unspecified the devices hardware ID will be used
+    ; -D FACTORY_JWT_SECRET=\"esp8266-react\"