reemo3dp

This PR adds snapshot tests using [`pytest.golden`](https://github.com/oprypin/pytest-golden) for several effects, asserting that the RGB values for 10 LEDs over 100 frames haven't changed. I've included a `requirements.txt` generated from poetry...

See https://github.com/julianschill/klipper-led_effect/blob/c735fe52e1070632919f125513a0552e03739a5f/src/led_effect.py#L1087

My bed mesh starts at `xmin = 0`, which led to the X portion of the move to not be executed. To reproduce: ```toml [probe] x_offset: 25 y_offset: 0 [bed_mesh]...

## Summary - `preview_generator` for generating GIFs from layer definitions (as shown in `./docs/LED_Effect.md`) - `klipper_tests` testing installation and initialization of the plugin in docker using real klipper - Keeps...