GPIOMods

- corrected the placeholder name
- fixed bug with duty cycle in extreme positions, which leaded to a high load and communication loss

Corrected Frequency calculation

Added initial beta of the Soft AIN Sampling FB.
With it, it should be possible to measure analog inputs, by using two digital Pins (1 In, 1 Out).

Initial import of the GPIOMods library. It contains the Soft PWM driver

Created Directory ...