Version 0.5.0

Finalize the extract of the race track system for 1/24 to 1/32 scale RC cars from the repository jsconan/things.

• Fix a typo in some comments.
• Use the shared internal shape linkProfile instead of redefining it in barrierLinkProfile.
• Add a default printer config for the slicer.
• Add a slicer script.

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Notes:

• Import from the repository jsconan/things
• Extract of the pull request jsconan/things#59

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Pull requests:

• Feature/Import from repo Things/Version 0.5.0 by @jsconan in #14
• Release 0.5.0 by @jsconan in #15

Full Changelog: 0.4.2...0.5.0