💥 Rename HostBridge to PluginBridge

As mentioned in the last commit. The original reasoning behind these
names was that the HostBridge talks to the host, and the PluginBridge
talks to the plugin, but you could also argue that the HostBridge should
be part of the Wine VST host and the PluginBridge should be part of the
VST plugin. This removes that ambiguity.

src/common/events.h

@@ -284,8 +284,8 @@ auto passthrough_event(AEffect* plugin, F callback) {
                     // plugin.
 
                     // These are the same fields written by bitsery in the
-                    // initialization of `HostBridge`. I can't think of a way t
-                    // oreuse the serializer without first having to serialize
+                    // initialization of `PluginBridge`. I can't think of a way
+                    // to reuse the serializer without first having to serialize
                     // `updated_plugin` first though.
                     plugin->magic = updated_plugin.magic;
                     plugin->numPrograms = updated_plugin.numPrograms;

src/common/serialization.h

@@ -348,7 +348,8 @@ struct Event {
  *   gets passed along.
  * - A (short) string.
  * - Some binary blob stored as a byte vector. During `effGetChunk` this will
-     contain some chunk data that should be written to `HostBridge::chunk_data`.
+     contain some chunk data that should be written to
+     `PluginBridge::chunk_data`.
  * - A specific struct in response to an event such as `audioMasterGetTime` or
  *   `audioMasterIOChanged`.
  * - An X11 window pointer for the editor window.