[2/2] TrafficMeter: added option for auto-hiding on inactivity

Signed-off-by: k2wl <kar2wlan@gmail.com>

Conflicts:
	res/values/tesla_strings.xml

Change-Id: Iec3402c1064ee7e13748e33224459cb93dc26265
Settings: network traffic color option (2/2)

Change-Id: I4374c1ab97a0729b095023bdc37abde8b252d7c0
Signed-off-by: k2wl <kar2wlan@gmail.com>