Simple Physics API modification for Lua
See merge request OpenMW/openmw!1216
(cherry picked from commit d88494c90b501d0832ae0330a0ca81d8b8e5aa50)
02dd055a Save hitObject in castSphere() just like in castRay()
0793d0bf Allow to override collision mask and group for castSphere() as for castRay()
imprecision issue with projectile collision detection.
Simplify the mechanics: manage hits in one spot.
Give magic projectiles a collision shape similar in size to their visible
model.
Rename the 2 convex result callback to clearly state their purpose.
