Custom telemetry page

Based on Arducopter_Status.
Basically same info from original example, but different layout with
sharper BMP and sticky throttle option (padlock).
Display: model name, flight mode, arm/safe, sticky throttle, battery
(+min) voltage, min cell (+min), total intensity (+max), total power,
consumption gauge, cell gauge, magnetic heading, RSSI, vertical speed,
ground speed (+max), altitude (+max), timer1, distance to home (+max),
HDOP, relative heading, new notification from APM.
Use OpenTx Amber voice.

Nota: Relative heading needs rework.