Previously, setting the worker thread count to 'Auto' would always spawn
one worker thread because Musikernel's DSP is efficient enough that
a single thread on most CPUs can run most projects, and because at the
time there were some issues with multi-core scaling.

Now, multi-core scaling is almost perfect, with no noticeable overhead even
with many worker threads on a very light project, make the 'Auto'
setting favor many, many worker threads...