Sprint 2: Update PluginBridgeEditor.h \u2014 add Load Plugin button

Source/PluginBridgeEditor.h

@@ -15,11 +15,15 @@ public:
 
 private:
     void timerCallback() override;
+    void loadPluginClicked();
 
     PluginBridgeProcessor& processorRef;
+
     juce::Label titleLabel;
     juce::Label statusLabel;
     juce::Label portLabel;
+    juce::Label pluginLabel;
+    juce::TextButton loadButton{"Load Plugin"};
 
     JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(PluginBridgeEditor)
 };