Introducing Shapecasts

[BubbleNinjaisnoob (Joe)]

@subcritical

Finally, shapecasts do not use a margin yet – In other words, casting a shape against a part that is infinitesimally close will not register as a hit. We will be adding tolerances to fix this case.

@subcritical marjins when?‌‌‌‌‌‌‌‌‌‌‌‌