Initial work to implement offline render in stand alone build

Source/PluginEditor.h

@@ -241,6 +241,7 @@ public:
 
 	WaveformComponent m_wavecomponent;
 	void chooseFile();
+	void showRenderDialog();
 private:
     PaulstretchpluginAudioProcessor& processor;
 	uptrvec<ParameterComponent> m_parcomps;
@@ -248,6 +249,7 @@ private:
 	PerfMeterComponent m_perfmeter;
 	TextButton m_import_button;
 	TextButton m_settings_button;
+	TextButton m_render_button;
 	Label m_info_label;
 	SpectralChainEditor m_spec_order_ed;