Minor release for SVG feature shape cavities.
- Adds SVG shape blocks on FTR_SHAPE for custom piece cavities.
- Scales imported SVG outlines by required SVG_WIDTH_MM and preserves aspect ratio.
- Adds SVG_CLEARANCE_MM outline expansion and validation for missing/invalid SVG shape block data.
- Skips unsupported SVG cavity chamfers with validation warnings.
- Updates shipped starter/example includes to boardgame_insert_toolkit_lib.4.12.0.scad.