Move WantsConfiguration to common

We'll also need this for CLAP.

src/common/serialization/common.h

@@ -22,6 +22,7 @@
 #include <cstdint>
 #include <type_traits>
 
+#include "../configuration.h"
 #include "../plugins.h"
 
 // The plugin should always be compiled to a 64-bit version, but the host
@@ -43,6 +44,23 @@ struct Ack {
     void serialize(S&) {}
 };
 
+/**
+ * Marker struct to indicate the other side (the plugin) should send a copy of
+ * the configuration. During this process we will also transmit the version
+ * string from the host, so we can show a little warning when the user forgot to
+ * rerun `yabridgectl sync` (and the initialization was still successful).
+ */
+struct WantsConfiguration {
+    using Response = Configuration;
+
+    std::string host_version;
+
+    template <typename S>
+    void serialize(S& s) {
+        s.text1b(host_version, 128);
+    }
+};
+
 /**
  * An object containing the startup options for hosting a plugin. These options
  * are passed to `yabridge-host.exe` as command line arguments, and they are

src/common/serialization/vst3.h

@@ -21,7 +21,6 @@
 #include "../bitsery/ext/in-place-variant.h"
 
 #include "../bitsery/ext/message-reference.h"
-#include "../configuration.h"
 #include "../utils.h"
 #include "common.h"
 #include "vst3/component-handler-proxy.h"
@@ -49,23 +48,6 @@
 // All messages for creating objects and calling interfaces on them are defined
 // as part of the interfaces and implementations in `vst3/`
 
-/**
- * Marker struct to indicate the other side (the plugin) should send a copy of
- * the configuration. During this process we will also transmit the version
- * string from the host, so we can show a little warning when the user forgot to
- * rerun `yabridgectl sync` (and the initialization was still successful).
- */
-struct WantsConfiguration {
-    using Response = Configuration;
-
-    std::string host_version;
-
-    template <typename S>
-    void serialize(S& s) {
-        s.text1b(host_version, 128);
-    }
-};
-
 /**
  * When we send a control message from the plugin to the Wine plugin host, this
  * encodes the information we request or the operation we want to perform. A