Split YaEditController into YaEditController{,2}

Since even though the title would make you assume it's a versioned
interface, it's not.

src/common/serialization/vst3/plugin/edit-controller-2.cpp

@@ -0,0 +1,27 @@
+// yabridge: a Wine VST bridge
+// Copyright (C) 2020  Robbert van der Helm
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#include "edit-controller-2.h"
+
+YaEditController2::ConstructArgs::ConstructArgs() {}
+
+YaEditController2::ConstructArgs::ConstructArgs(
+    Steinberg::IPtr<Steinberg::FUnknown> object)
+    : supported(
+          Steinberg::FUnknownPtr<Steinberg::Vst::IEditController2>(object)) {}
+
+YaEditController2::YaEditController2(const ConstructArgs&& args)
+    : arguments(std::move(args)) {}