Huge improvements to both CPU and memory scaling in Euphoria...

(with the side-effect of some popping sounds at note-on, but I can
fix that...)
Initial fixes to the sound artifact regression when I fixed the
scalability bug...   A few more effects probably need it also...
Gracefully handle exceptions in parsing SFZ files...
More scalability improvements for Euphoria...
Increase Euphoria's max sample count to 128 now that the scalability
issues have been addressed...