Simplify the initialisation in the SSD1306Ascii driver, by removing some of the complex structures that were inherited from the library on which it is based. This should also allow it to compile on the ESP32 platform.
Reduce the time spent with interrupts disabled in I2CManager response code by enabling interrupts after the state machine has finished.
Also, some comment changes.
When testing CS in minimal HAL mode but with mySetup.h and myAutomation.h files present, I experienced freezing of the arduino because the standard pinMode, digitalWrite etc don't validate the pin number passed to them. So I've added checks on the pin number to the configure, write and read functions in the minimal HAL.
Ensure that HAL devices are created before use by moving the call to mySetup into IODevice::begin(). The need for this became evident when it was noted that RMFT (EX-RAIL) interacts with HAL devices during its initialisation, by enabling pull-ups on digital inputs.
Any
If an Arduino pin was used as an input (e.g. by EXRAIL) without previously configuring it, the default pullup wouldn't be set up. Now, on first call to the _read() method the pullup will be enabled.
Previously, pullups were enabled on GPIO Expander digital pins by default, even if the pin was only ever used as an output. This could lead to a spurious HIGH state being seen by external equipment before the output is initialised to LOW. To avoid this, the pin pullup is now not enabled until a configure or read operation is issued for the pin.
Alias for existing <D SERVO ...> command added as <D ANOUT ...> (since not all analogue outputs are servos). Also, <D ANIN vpin> added to display the value of an analogue input pin.
