TmpFileRt::get_samples_written() returns the number of
samples written *to disk*. It is only valid after the FileFlushed
signal is emitted.
This fixes an assert() with Limiter and Analyzer being configured
with a too low total sample-count, leading to an overflow in
the analysis graph array.
* Fix exporting multiple formats with different
normalization settings or demo-noise settings
* Add true-peak limiter (based on x42-limiter dpl.lv2)
* Optionally use a limiter for loudness normalization
* Fall back to short-term loudness when normalizing
material too short for integrating loudness.
