aabb and sphere intersect functions

[recp]

AABB functions:

• AABB vs AABB
• AABB vs Point
• AABB vs Sphere
• AABB contains AABB

New features for sphere:

• Sphere Transform, Merge (same as AABB helpers)
• Sphere vs Sphere
• Sphere vs Point

I used glm_aabb_aabb for testing intersection, it could be glm_aabb_intersect or glm_aabb_intr but since for instance glm_aabb_point is used instead of glm_aabb_intersect_point same convention is also used for aabb.

Sphere Representation in cglm is vec4: [center.x, center.y, center.z, radii], functions will accept vec4 instead of two parameter for each sphere e.g . vec3 for center and float for radius. It is combined into vec4 in cglm.

If you have better idea or don't like this design please let me know.

[coveralls]

Coverage decreased (-0.5%) to 13.166% when pulling 857265b on sphere into af812e8 on master.