effect.c: Fully reinitialize struct in destroy_effects_chain().
Allow rebuilding the effects chain when in interactive mode.
effects/crossfeed_hrtf.c: Don't output extra zeros when draining.
util.c: Close file.
Change progress display behavior.

Unless there is unexpected text output, the progress line will now be cleared
and reused when text is printed (or when quitting). This prevents old progress
lines from cluttering up the output.
Show an info message when rebuilding the effects chain.