upgrade to JUCE 5.4.3. Remove (probably) unused JUCE modules. Remove VST2 target (it's been end-of-life'd by Steinberg and by JUCE)

modules/juce_core/threads/juce_WaitableEvent.h

@@ -27,9 +27,8 @@ namespace juce
 /**
     Allows threads to wait for events triggered by other threads.
 
-    A thread can call wait() on a WaitableObject, and this will suspend the
-    calling thread until another thread wakes it up by calling the signal()
-    method.
+    A thread can call WaitableEvent::wait() to suspend the calling thread until
+    another thread wakes it up by calling the WaitableEvent::signal() method.
 
     @tags{Core}
 */