Easier collision objects + spline platforms

[Reonu]

Ability to easily create collision objects that can (but don't have to) follow a spline directly in fast64.

• creating moving platform object behavior
• creating the levelscript command
• creating the struct

[thecozies]

two separate level commands:

moving platform levelscript command:
geo, collision, position, angle, act flags, x rot, y rot, z rot, spline pointer (spline struct contains pointer to spline data and details on following it)

object with geo:
literally the exact same as regular objects (bhv, position, angle, bparams, act flags) but model id is replaced with geo pointer and collision

[arthurtilly]

#define OBJECT_FROM_GEO(geo, collision, posX, posY, posZ, angleX, angleY, angleZ, behParam, beh, acts) \

#define MOVING_PLATFORM(geo, collision, posX, posY, posZ, angleX, angleY, angleZ, rotVelX, rotVelY, rotVelZ, spline, acts) \

struct SplineData {
Vec3f *spline;
s16 speed;
u8 activatedByMario;
u8 loop;
}

[gheskett]

Relates to #316