Add option to configure default transition delay. (#140)

src/headers/advanced-scene-switcher.hpp

@@ -163,6 +163,7 @@ public slots:
 	void on_defaultTransitionsUp_clicked();
 	void on_defaultTransitionsDown_clicked();
 	void on_transitionOverridecheckBox_stateChanged(int state);
+	void on_defTransitionDelay_valueChanged(int value);
 
 	void on_browseButton_clicked();
 	void on_readFileCheckBox_stateChanged(int state);

src/headers/switch-transitions.hpp

@@ -18,6 +18,7 @@ struct SceneTransition : SceneSwitcherEntry {
 
 struct DefaultSceneTransition : SceneSwitcherEntry {
 	static bool pause;
+	static unsigned int delay;
 
 	const char *getType() { return "def_transition"; }
 	bool checkMatch(OBSWeakSource currentScene);