Support for CFG_SENSOR_AUTOENABLE added

The elements <AutoEnable> and <AutoEnableDelay> have been added as options to the XML configuration file. If “<AutoEnable>yes</AutoEnable>” is added to a sonsor, this sensor will be added to “CFG_SENSOR_AUTOENABLE”, i.e. the list of sensors, events from which are automatically enabled when the payload is powered on, and disabled when the payload is powered off.

The value of <AutoEnableDelay> defines the (global) delay implemented by the firmware between powering on the payload and enabling events from the sensors listed by the CFG_SENSOR_AUTOENABLE configuration parameter. This configuration parameter is defined in milliseconds and has effect only if the CFG_SENSOR_AUTOENABLE configuration parameter is defined. If <AutoEnableDelay> is not specified, 1000 ms will be used as default.