A rule/sensor indicator icon

[dsoutw]

Add a sensor indicator to show if it is using a type of rule.

The icon should have four states:

1. Not show:
   Does not have a rule
2. Icon:
   Has at least a rule and the sensor is working properly
3. Icon + Not / Icon grayed out:
   Has at least a rule but the sensor is closed. For example, GPS turned off
4. Icon + '!' / Icon red:
   Error. For example, does not have the corresponding permission(s)

[dsoutw]

The ui part will be done in the future release.