SFZ effect plugins

[michael02022]

Concept

A plugin FX format (it could be an existent one or a custom one specific for SFZ players)
that can be installed by the user and the SFZ files call those FX plugins under the <effects> header.
This will make the FX DSP independient of the SFZ player and for the sound designer it makes sure their
presets sounds as intended on every platform (SFZ player) that supports this plugin feature.

Opcodes

The opcodes doesn't need to be specific for every plugin, it could be a generic opcode where there are parameters IDs,
and each one depends on the plugin about what's for. So the SFZ player dev doesn't have to be worried about this,
only the sample library developer who has the documentation of what ID parameters means. The opcodes could be simple as
fxparam100=64 fxparam100_oncc71=100 something like this.