pub type FreeStringFn = extern "C" fn(s: StbString);Expand description
Function pointer a plugin exports to free a StbString it produced.
Idempotent: freeing an already-freed or empty StbString is a no-op.
The host calls this for every StbString it receives from the plugin; the
plugin calls the host’s free_string (from PluginApiVt) for every
StbString it receives from the host.