Release v2.2.23

• Fixed problem where Pow-U was unable to stay connected to WiFi
• Fixed disappearing price graph on low energy price
• Fixed incorrect price graph update, making graph run wild after keeping browser open for a while
• Fixed problem where unsetting fixed price did not work
• Improved MQTT/SSL connection options. Can now connect without CA/cert/key, or with just CA
• Added option to delete CA/cert/key for MQTT
• Added option to disable 802.11b on ESP8266