[Suggestion] Make homing weapons use A_SeekerMissile

[Badz]

Currently, homing weapons inherit from MageStaffFX2 and use A_MStaffTrack for their homing properties; that inheritance tends to cause issues when the projectile collides with something that isn't a player. However, with the advent of Zandronum 2.0, A_SeekerMissile now has access to all of its parameters, allowing homing missiles to no longer rely on that workaround anymore thanks to the SMF_LOOK flag! Also, it allows for more precise control of the homing capabilities of the projectile.

Unrelated note, +NOEXPLODEFLOOR is also supposed to work now

[Russel]

I planned on recoding Magnet Missile and Dive Missile to use this for v5 anyhow due to consistency reasons.

I'll leave this in the main section until we have time to discuss it.

[Messatsu]

Heh, gonna be a jerk to Lego and move this to pending.  If A_Seekermissile provides advantages, we will use it.  If it shows problems we won't.