Don't copy anything to the user's home directory

On macOS (and probably other OS), this library copies a file called `libj2v8_macosx_x86_64.dylib` to the user's home directory. I believe this shouldn't be done, as it's an eyesore and no other program does that without permission. Is it really necessary to copy the file anywhere? If so, there are better alternatives that are not in plain sight, e.g. `~/Library/Caches`.