Add all the boilerplate for the Vst3PluginBridge

And now that I also have an idea of what the communication model will
look like, this can server as a base for instantiating plugins.

src/common/logging/vst2.h

@@ -32,6 +32,9 @@
  */
 std::optional<std::string> opcode_to_string(bool is_dispatch, int opcode);
 
+/**
+ * Provides VST2 specific logging functionality for debugging plugins.
+ */
 class Vst2Logger : public Logger {
    public:
     // The following functions are for logging specific events, they are only

src/common/logging/vst3.h

@@ -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/>.
+
+#pragma once
+
+#include "common.h"
+
+/**
+ * Provides VST3-specific logging functionality for debugging plugins.
+ */
+class Vst3Logger : public Logger {
+   public:
+    // TODO: Logging interface for VST3 plugins
+};