Add the ESPER-UTAU resampler in future updates.

[kawaii21-droid]

I know this resampler isn't very well-known, but I have a few reasons why it could be added in future updates.

1. It is open source.
2. It's a resampler that focuses on quality, with better quality than wordline-r.
3. It runs better on mobile phones because it doesn't demand as much from the processor as Hifisampler and renders faster.
4. It has a wide variety of flags, allowing you to modify the vocals however you like.
5. has growl