Fix #7885: [Fluidsynth] Use recommended method of setting sample rate #7983
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This is a large changeset for a small change.
As the only way to get the sample rate for the synth is to install the music render routine, it has to be installed before the synth is ready for use. This means the render routine could risk being called while the synth is not fully set up.
For this reason, set up full mutex protection of the synth objects.