Nglui

Added

- **EasyViewer** At long last, you can set the background color in `set_view_options` with the argument `background_color`. As elsewhere, this uses [webcolors](https://webcolors.readthedocs.io/) to deal with color parsing, so it can take names or rgb or hex.
- **StateBuilder** StateBuilder can now set the background color in in `view_kws` with the key `background_color`.
- **StateBuilder** *Mapping sets* offer a new and simple iapproach to having multiple dataframes with different mapping rules.
- **StateBuilder** Mapping rules can handle dataframes where the point position components are split across different columns, assuming that the suffices are always `_x`, `_y`, and `_z`. Set `split_positions=True` in the mapping rule to use this.

Changed

- **StateBuilder** Mapping rules now default to `set_position = True`.

Added

- **StateBuilder** A number of helper functions to produce common states have been added to statebuilder.
You can use the function `make_neuron_neuroglancer_link` to generate a link with one or more root ids and, optionally, their synapses.
Further, you can use the function `make_synapse_neuroglancer_link` to generate a state from a synapse dataframe.
- **StateBuilder** Linked segmentations and annotation groups now support multiple columns.
For linked segmentations, this adds multiple root ids per annotation.
For groups, each unique combinations of values gets its own group.
- **StateBuilder** and **EasyViewer** Colors for layers or segment ids can now be in RGB tuples with values between 0--1 or CSS3 named colors, not just hex.
- **StateBuilder** When using the `client=` argument, viewer resolution is inferred from the client info and does not need to be passed as an additional argument.

Fixed

- **StateBuilder** For SegmentationLayerConfigs, adding selection maps via `add_selection_map` is more robust.

Fixed

- **StateBuilder** Multipoint now works with `set_position`.

Fixed

- **StateBuilder** Multipoint performance has improved.

Added

- **StateBuilder** In all Mappers, setting `multipoint=True` will allow the point columns to contain multiple points per row, with the other columns assigned to all points in the row. Note that for Mappers with multiple point columns (e.g. LineMappers, SphereMappers, and BoundingBoxMappers), the number of values must be the same in both columns.

Added

- **StateBuilder** You can now set a timestamp in SegmentationLayerConfig. Either datetime or unix epoch are allowed.