Add fixmes for incorrect byte orders

As pointed out on the Discord. Fixing this will require a breaking
change, but right we report incorrect plugin IDs meaning that projects
saved under Windows cannot be opened under Linux with yabridge so this
really needs a fix.

src/common/serialization/vst3/host-context/plug-interface-support.h

@@ -66,6 +66,9 @@ class YaPlugInterfaceSupport : public Steinberg::Vst::IPlugInterfaceSupport {
      * Message to pass through a call to
      * `IPlugInterfaceSupport::isPlugInterfaceSupported(iid)` to the host
      * context provided by the host.
+     *
+     * TODO: Figure out if we should translate the UIDs from Windows COM to
+     *       non-Windows COM.
      */
     struct IsPlugInterfaceSupported {
         using Response = UniversalTResult;

src/common/serialization/vst3/plugin-factory.cpp

@@ -25,6 +25,13 @@ YaPluginFactory::ConstructArgs::ConstructArgs() {}
 
 YaPluginFactory::ConstructArgs::ConstructArgs(
     Steinberg::IPtr<Steinberg::IPluginFactory> factory) {
+    // FIXME: The class IDs are incorrect! See the `INLINE_UID` macro. We need
+    //        to shuffle the byte orders around for plugins to be compatible
+    //        with projects saved under Windows and with native Linux versions
+    //        of the same plugin.
+    // FIXME: We need to do similar translations everywhere where we encounter
+    //        `ArrayUID`, such as `IComponent::getControllerClassId()`
+
     // `IPluginFactory::getFactoryInfo`
     if (Steinberg::PFactoryInfo info;
         factory->getFactoryInfo(&info) == Steinberg::kResultOk) {