Allow loading VST3 modules

Doesn't actually work yet or do anything, but it compiles and it runs.

src/plugin/vst3-plugin.cpp

@@ -36,6 +36,8 @@ SMTG_EXPORT_SYMBOL Steinberg::IPluginFactory* PLUGIN_API GetPluginFactory() {
         //       already implemented and which are left
         // TODO: And when we get a query for some interface that we do not (yet)
         //       support, we should print some easy to spot warning message
+        // TODO: Check whether `IPlugView::isPlatformTypeSupported` needs
+        //       special handling.
         // TODO: Should we always use plugin groups or for VST3 plugins? Since
         //       they seem to be very keen on sharing resources and leaving
         //       modules loaded.

src/wine-host/bridges/vst3.cpp

@@ -17,4 +17,20 @@
 #include "vst3.h"
 
 // TODO: Do something with this, I just wanted to get the build working
+// TODO: Check if this can load both regular Unix style paths with Wine. Oh and
+//       check if it works at all.
+// TODO: Check if <filesystem> now works with Winelib, or replace with Boost
 #include <public.sdk/source/vst/hosting/module_win32.cpp>
+
+void justdewit(const std::string& path) {
+    std::string error;
+    std::shared_ptr<VST3::Hosting::Module> plugin =
+        VST3::Hosting::Win32Module::create(path, error);
+
+    if (plugin) {
+        std::cerr << "Hooray!" << std::endl;
+    } else {
+        std::cerr << "Ohnoes!" << std::endl;
+        std::cerr << error << std::endl;
+    }
+}

src/wine-host/bridges/vst3.h

@@ -15,3 +15,7 @@
 // along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 #pragma once
+
+#include <string>
+
+void justdewit(const std::string& path);

src/wine-host/individual-host.cpp

@@ -85,6 +85,8 @@ main(int argc, char* argv[]) {
                 break;
             case PluginType::vst3:
 #ifdef WITH_VST3
+                justdewit(plugin_location);
+
                 std::cerr << "TODO: Not yet implemented" << std::endl;
                 return 1;
 #else