0.31.0

• chore: repo housekeeping and docs refresh for the grouped-parameter API (#298)
• • untrack the maintainer-only tools/build_.py scripts (kept on disk)
    and broaden the ignore rule to tools/.py
• remove nbqa's leaked *_nbqa_ipynb.py temp files and ignore the pattern
• refresh the docs and README for the grouped render-parameter API: fix
  examples that used removed loose keywords, add a Render-options
  reference page, complete the migration guide, and fix a broken link
• rephrase historical change-log entries to drop vendored-source and
  library names
• Closes #299, #300
• refactor(glyphs)!: move render/prep logic onto the grouped parameter objects (#291)
• Cohere the grouped rendering/prep objects with the logic that consumes
  their fields (the ColorScaling.build_norm / to_options model): the object
  owns the transform, the glyph just calls it. Also groups ArrayGlyph's
  loose RGB band-prep keywords into a new RgbBands object.
• • ColorBar owns to_options(), resolve(), reset_options(), and
    specifies_placement(); _resolve_colorbar just delegates
• PointOverlay.draw(), FrameLabel.resolve_location()/draw(), and
  PanelLabels.label_for()/panel_title()/validate() replace the inline
  plot/animate/facet logic; base Glyph._plot_point_values is removed
• add DataStyle.for_apply_style() and unify the hillshade "unset"
  sentinel, deleting three per-glyph duplicates
• add Glyph._snapshot_group_options() for the shared pre-merge
  option-snapshot (ArrayGlyph.plot and KDEGlyph.plot)
• group ArrayGlyph's rgb / surface_reflectance / cutoff / percentile
  constructor keywords into an RgbBands object owning validate() /
  prepare(); init drops from 10 to 7 explicit params
• fix the RGB surface-reflectance cutoff to clip each band's data, not
  the integer band index
• add unit tests + doctest examples for the new methods; migrate the
  examples, the array_glyph notebook, and add a migration-guide entry
• BREAKING CHANGE: ArrayGlyph no longer accepts the loose rgb /
  surface_reflectance / cutoff / percentile constructor keywords; pass
  rgb_bands=RgbBands([r, g, b], surface_reflectance=..., cutoff=...,
  percentile=...) instead. prepare_array() and scale_percentile() keep
  their loose keyword signatures.
• Closes #292, #293, #294, #295, #296, #297