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/zip/juce_ZipFile.h

@@ -224,7 +224,6 @@ public:
         //==============================================================================
     private:
         struct Item;
-        friend struct ContainerDeletePolicy<Item>;
         OwnedArray<Item> items;
 
         JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (Builder)
@@ -244,7 +243,7 @@ private:
    #if JUCE_DEBUG
     struct OpenStreamCounter
     {
-        OpenStreamCounter() {}
+        OpenStreamCounter() = default;
         ~OpenStreamCounter();
 
         int numOpenStreams = 0;