Fix stupid bug in syx loading

It was not loading the first event in the syx file because 0 was used
as a special offset.
Make sure m_converter is set to 0 after free

Avoids use-after-free.
Nicer name in ttl file
Make timbre reading/writing work

Addresses were misaligned - I'm not sure whether putting the Timbres
bank at 60000 (and removing the explicit 128 offset)
is the right thing to do, although there isn't anything
else there.

The other (possibly better) solution would be to make sure readMemory
uses the same offset as write.
Make save/restore state actually work

- Init synth in constructor/deinit it in destructor.
  This makes it possible to save/restore state without activate() being
  called - qtractor makes use of this
Soft-reset on plugin deactivate

Makes it possible to use deactivate() as panic button.