Gdsfactory

- more consistent names on component factories
- add simulation_settings to Tech
- sparameters_path: pathlib.Path = CONFIG["sp"]
- simulation_settings: SimulationSettings = simulation_settings
- layer_stack: LayerStack = LAYER_STACK
- add Pdk.write_sparameters()

- better docstrings
- simplify code for pp.path.smooth
- replace `pp.c.waveguide()` by `pp.components.waveguide()`. `pp.c.waveguide()` still works.
- replace `pp.qp()` by `pp.plot()` to be consistent with `c = Component()` and `c.plot()`
- added `get_component_from_yaml` Pdk class

- add vertical_te and vertical_tm ports to grating couplers
- remove klive warning when not klayout is not open (if klayout is not installed or running it will just fail silently)
- replace cladding for bend_circular and bend_euler with square cladding
- added `component.show()`
- added `component.show(show_subports=True)`
- added `pf merge-cells`
- added `auto_taper_to_wide_waveguides` option to add_fiber_array
- `add_padding` returns the same component, `add_padding` returns a container with component inside
- remove container decorator, containers are just regular cells now with cell decorator
- add `add_pin_square_double` and make it the default

- consistent port naming path.component extrusion

- better docs

- euler bends as default (with_arc_floorplan=True)
- define bends and straighs by path and cross_section
- tech file dataclass in pp.config
- added pp.pdk with tests
- include notebooks in docs with nbsphinx
- regression test for labels
- fixed CACHE key value by using the actual cellname