use a led like indicator for the prfiler state * led-indicator.cc: implememntation od class led_indicator; (led_indicator): sete size and initial state; (style_sheet): set the style sheet, where the led is emulated by a color gradient * led-indicator.h: class led_indicator derived from QLabel, enum with possible states, new ctor, new method for generating the required style sheet * main-window.cc (main_window): change the status indicaotr fomr QLabel to the new led_indicator and add it to the status bar (handle_profiler_status_update): set the led state accordingly * main-window.h: include led-indicator.h, change profiler indicator from QLabel to led_indicator * module.mk: add the files for the new led_indicator

--- a/libgui/src/main-window.h	Fri Nov 13 08:31:12 2020 +0100
+++ b/libgui/src/main-window.h	Fri Nov 13 20:50:37 2020 +0100
@@ -53,6 +53,7 @@
 #include "find-files-dialog.h"
 #include "history-dock-widget.h"
 #include "interpreter-qobject.h"
+#include "led-indicator.h"
 #include "octave-dock-widget.h"
 #include "octave-qobject.h"
 #include "qt-interpreter-events.h"
@@ -319,7 +320,7 @@
     //! Toolbar.
 
     QStatusBar *m_status_bar;
-    QLabel *m_profiler_status_indicator;
+    led_indicator *m_profiler_status_indicator;
 
     //! Dock widgets.
     //!@{