Added Hivebrain labels

I found myself doing this for the second time, so I decided to make it
the last.

I also renamed Snd_FadeOutSFX and Snd_FadeOutSFX2. The Snd prefix is
unnecessary and clashes with similar code's labels, and SFX2 focuses on
Special SFXes.

Also added cfSetCommunication's previous label.

I use a tab size of 8, and the comment alignment in here seems off. Though I haven't changed anything outside of the Go_Addresses, since I don't know if that tab size is standard for any disassemblies outside of S2's (see s2.notes.txt).