Seems like an essential part of the toolbox -- we have Point, LineSegment
and Line and now we have also all "swept sphere" alternatives to them --
Sphere (swept "along" the point), Capsule (swept along line segment) and
Cylinder (swept along infinite line).
"Implemented" collision detection with point and sphere, which is just
simplified version of collision detection implemented for Capsule (i.e.
no need to check for cap cases).
Current implementation provided logical operations as if it were boolean
operations, which is wrong. Booleans might (or might not) be implemented
in the future, but currently the logical are enough.
* All pages are now named with lowercased letters with dashes between
letters.
* Added coding style guidelines.
* Extended building documentation with guide how to download Magnum.