Add <kindred> elements to ztools (priority=50) and silo (priority=60)
package.xml files declaring min_create_version, load_priority,
pure_python, and context metadata.
Fix addon_loader.py topological sort to use level-by-level processing
with (priority, name) sorting within each level, replacing
static_order() which did not guarantee deterministic ordering.
Add docs/src/development/package-xml-schema.md documenting the full
field reference, schema example, and backward compatibility notes.
Closes#252
- Remove hand-crafted kindred-icons/ in favor of auto-generated themed icons
- Add icons/mappings/ with FCAD.csv (Tango palette) and kindred.csv (Catppuccin Mocha)
- Add icons/retheme.py script to remap upstream FreeCAD SVG colors
- Generate icons/themed/ with 1,595 themed SVGs (45,300 color replacements)
- BitmapFactory loads icons/themed/ as highest priority before default icons
- 157-color mapping covers the full Tango palette, interpolating between
4 luminance anchors per color family
Regenerate: python3 icons/retheme.py
