Support for configuring the side tone line states. #98
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There might be cases where the side tone digital line (no square wave generation, just a active beeper/buzzer attached) is active on LOW, not HIGH. For example the Arduino Multi Function Shield, a very convenient test platform. Therefore I added two defines in the spirit of the other active/inactive switches to control the HIGH/LOW states.
Then, I used these defines to replace all corresponding occurrences for HIGH and LOW such as: