* Moves the dog sound out of the Doom-specific sounds in SNDINFO to address this,
* Renames the dog actor to MBFHelperDog to prevent name conflicts,
* Adds APROP_Score to CheckActorProperty,
* Completes the randomspawner update (the reason I moved the recursion counter out of
special1 was that I found some projectiles had this set to them, for example in
A_LichAttack, but I forgot to add transfer for them),
* Provides centered sprites for beta plasma balls if this is deemed deserving correction.
SVN r1847 (trunk)