GPS powered by Espruino pin(s)

For control UI and visualization of the behavior I used Espruino IDE's built-in and enabled Testing facility with a sampling rate of 2 samples / sec.

I defined the values to plot:

1. volts  - eps.getVolts()
2. on     - (eps._isOn) ? 1 : 0
3. fix    - gps._fix
4. sats   - gps._sats

I defined the switch on and off commands:

1. on   - gps.switch(1); 
1. off  - gps.switch(0); 

A convenient click on command buttons switches the GPS on and off.

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