Feature: configuration and reconfiguration

[moehrem]

Adding to enhanced configuration:

• sleep time between "connection checks"
• sleep time between "retry connection"
• max retry attempts (0 = infinite)
• manufacturer?
• Services (status, gps, text, immediate text, alarm)
• MQTT publishing true/false
• MQTT topic

For reconfiguration:

• sleep time between "connection checks"
• sleep time between "retry connection"
• max retry attempts (0 = infinite)
• Services (status, gps, text, immediate text, alarm)
• MQTT publishing true/false
• MQTT topic