OnStep for EQ6

OnStep replacement board for EQ 6 Pro  on base [Howard Dutton](https://onstep.groups.io/g/main/wiki/3860) project Key properties: * Big USB B port * Bluetooth * Wi-Fi * Internal real time clock and PPS with battery backup * Port for polar scope illuminator * Three-channel controller for dew heaters or fans * DSLR timer * Weather sensor- temperature, pressure and humidity Panel for 3D printing on [Thingiverse](https://www.thingiverse.com/thing:4836661) Pinmaps is based on MaxESP3 but requires the following minor modifications:

#define Aux7        36    // 36 is internal DS3132 PPS or 39 external (GPS) PPS
#define OneWirePin  15    // OneWire
#define ReticlePin  19    // Polar scope iluminator
#define TonePin     2     // Tone

// PEC Optional - not use now
#define Pec 39
#define AnalogPecPin  A3// PEC Sense, analog or digital (GPIO39)

FreeCAD souce is [here](https://github.com/romanhujer/OnStep-Box/blob/master/EQ6.FCStd)