UI: Add stream delay options to advanced settings

I added stream delay options to advanced settings not just because I
feel it's an advanced option, but also to reduce clutter in the outputs
section and its sub-sections, which already have far too many options as
it is.

obs/window-basic-settings.hpp

@@ -222,6 +222,9 @@ private:
 	void SaveAdvancedSettings();
 	void SaveSettings();
 
+	void UpdateSimpleOutStreamDelayEstimate();
+	void UpdateAdvOutStreamDelayEstimate();
+
 private slots:
 	void on_theme_activated(int idx);
 
@@ -259,6 +262,8 @@ private slots:
 	void AdvancedChanged();
 	void AdvancedChangedRestart();
 
+	void UpdateStreamDelayEstimate();
+
 	void AdvOutRecCheckWarnings();
 
 protected: