Fix ASCII STL loading with current Three.js

[maxistar]

Fixes #61.

This updates three-stdlib so STLLoader no longer relies on LoaderUtils.decodeText from three. That API is unavailable in newer Three.js versions, which breaks ASCII/text STL parsing.

Changes:

• update three-stdlib to 2.36.1
• update the dev Three.js dependency used for local builds
• switch three-stdlib deep imports to the package public entrypoint

Verified with:

• yarn build
• yarn test
• yarn lint