Changed SoundGroupTable to use the right string type for the comparison.
Also changed from CStr8 to CStr because I prefer that spelling (and it's
more consistent with most other code).
This was SVN commit r4771.
# Attempted to make compilation faster
by including as little as possible in some .h files, and moving it into
.cpp.
Fixed BaseTechCollection memory leak.
This was SVN commit r3992.