build 200913. sound category volume modifiers, debug panel settings section, minor bug fixes

driveruipanels.h

@@ -96,6 +96,7 @@ private:
     // renders provided lines, under specified collapsing header
     bool render_section( std::string const &Header, std::vector<text_line> const &Lines );
     bool render_section_scenario();
+    bool render_section_settings();
 // members
     std::array<char, 1024> m_buffer;
     input_data m_input;