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Support inverted display on ST7735 (#105)

* Update device.py

try to init the odd version of st7735

* Change timed_reset -> hard_reset; add note about moving that capability into luma.core instead

* Removed timed/hard reset

Longer term, this extended reset should be implemented directly in the serial interface in luma.core. I will add that as a separate commit

```python
        # FIXME: longer term, this pause when resetting should be moved into luma.core's
        # serial implementation
        if hard_reset:
            spi = self._serial_interface
            spi._gpio.output(spi._RST, spi._gpio.LOW)
            time.sleep(0.1)
            spi._gpio.output(spi._RST, spi._gpio.HIGH)
            time.sleep(0.1)
            self.command(0x01)
            time.sleep(0.1)
        else:
```

* Inline display inversion

* Formatting

* PEP8 fix

Co-authored-by: Richard Hull <rm_hull@yahoo.co.uk>
Co-authored-by: Thijs Triemstra <info@collab.nl>

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