ObjImporter: the indices are actually global to whole file.

There just isn't any sane and easily parsable format.
WavAudioImporter: use PIC only when needed.

Also we don't export anything, so no need for -D*_EXPORTS definition.
Fixed PrimitiveQuery documentation.

Somehow this slipped through when splitting out the timer functions into
TimeQuery in 5f00a1926daa0092b11e36f7496414bc8b3665ae (a year ago!).