Allow arbitrary pin assignments #24
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Add new constructors and class variables to allow changing the pin layout.
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There are many variants of LCD displays using different pin assignments of the PCF8574 chip.
For a list, see e.g. the HD44780 library which lists 4 variants, and I personally own one with yet another.
This adds new constructors and class variables to allow changing the pin layout.
_sendNibble() and _write2Wire are updated accordingly.