Gdsfactory

- gdsdiff does not do booleans by default
- pin pre-commit versions

- added pp.components.path to easily extrude CrossSections
- added more pp.types (ComponentFactory, RouteFactory) as Callable[..., Component]
- Load a LayerColors object from a Klayout lyp file
- clean lyp from generic tech
- bend_euler accepts similar parameters as bend_circular (layers_cladding, cladding_offset)
- renamed bend_euler90 as bend_euler
- components adapted from picwriter take more similar values (layer_cladding, layer)
- pp.difftest can step over each GDS file with a geometric difference and decide what to do interactively
- adapted pp.path and pp.cross_section from phidl

- fixed some mypy errors
- added dx to coupler
- bezier has now number of points as a parameter
- improved docs
- allow to set min and max area of port markers to read

- refactor
- connect_strip to get_route
- connect_bundle to get_bundle
- connect_strip_way_points to get_route_from_waypoints
- make diff shows all difference from the difftest run
- snap length to 1nm in route waveguide references
- remove any waveguide reference on the routes which have a 1nm-snapped length equal to zero

- move tests to tests/ folder
- rename from `from pp.testing import difftest` to `from pp.difftest import difftest`
- remove pp.container containerize
- better type annontations
- replace some `c.show()` by a simpler `c.show()`

- better settings export
- fixed docs