Index pulse generation added

New features:

This release added a possibility to generate periodic index pulses. To enable this feature pass the pin for the index signal as third parameter to the constructor. The period of the index pulses can be set with setPeriod(unsigned p);

Example:

#include "EncSim.h"

EncSim encSim(0, 1, 2);             // A=0, B=1, Z=2

void setup()
{
    encSim.begin();
    encSim                          // setup parameters
        .setFrequency(100'000)      // 100 kCounts per second
        .setPeriod(4096)            // Index pulse every 4096 counts
        .setPhase(90)               // 90° phase signal
        .setTotalBounceDuration(0); // no bouncing

    encSim.moveRelAsync(INT32_MAX); // run for some time
}

void loop()
{
    Serial.println(encSim.current); // print current 'position'    
    delay(100);
}

Precompiled binaries for the SerialControl example can be found here: https://github.com/luni64/EncSim/tree/master/examples/SerialControl/precompiled_binaries