Partially implement IConnectionPoint::connect()

This now works for direct connections, which is probably how most hosts
will use this.

src/wine-host/bridges/vst3.cpp

@@ -32,6 +32,7 @@ InstanceInterfaces::InstanceInterfaces(
     : object(object),
       audio_processor(object),
       component(object),
+      connection_point(object),
       edit_controller(object),
       plugin_base(object) {}
 
@@ -250,6 +251,16 @@ void Vst3Bridge::run() {
                 return object_instances[request.instance_id]
                     .component->setActive(request.state);
             },
+            [&](const YaConnectionPoint::Connect& request)
+                -> YaConnectionPoint::Connect::Response {
+                // We can directly connect the underlying objects
+                // TODO: Add support for connecting objects through a proxy
+                //       object provided by the host
+                return object_instances[request.instance_id]
+                    .connection_point->connect(
+                        object_instances[request.other_instance_id]
+                            .connection_point);
+            },
             [&](YaEditController2::SetComponentState& request)
                 -> YaEditController2::SetComponentState::Response {
                 return object_instances[request.instance_id]

src/wine-host/bridges/vst3.h

@@ -54,6 +54,7 @@ struct InstanceInterfaces {
 
     Steinberg::FUnknownPtr<Steinberg::Vst::IAudioProcessor> audio_processor;
     Steinberg::FUnknownPtr<Steinberg::Vst::IComponent> component;
+    Steinberg::FUnknownPtr<Steinberg::Vst::IConnectionPoint> connection_point;
     Steinberg::FUnknownPtr<Steinberg::Vst::IEditController> edit_controller;
     Steinberg::FUnknownPtr<Steinberg::IPluginBase> plugin_base;
 };