💥 Rename PluginBridge to WineBridge

I had swapped these names around once before but I think going with
PluginBridge for the plugin and WineBridge for the Wine VST host is the
least ambiguous it can get.

src/plugin/host-bridge.cpp

@@ -260,7 +260,7 @@ HostBridge::HostBridge(audioMasterCallback host_callback)
         try {
             while (true) {
                 // TODO: Think of a nicer way to structure this and the similar
-                //       handler in `PluginBridge::handle_dispatch_midi_events`
+                //       handler in `WineBridge::handle_dispatch_midi_events`
                 receive_event(
                     vst_host_callback, std::pair<Logger&, bool>(logger, false),
                     [&](Event& event) {

src/plugin/host-bridge.h

@@ -87,7 +87,7 @@ class HostBridge {
      * Ask the VST plugin to process audio for us. If the plugin somehow does
      * not support `processReplacing()` and only supports the old `process()`
      * function, then this will be handled implicitely in
-     * `PluginBridge::handle_process_replacing()`.
+     * `WineBridge::handle_process_replacing()`.
      */
     void process_replacing(AEffect* plugin,
                            float** inputs,