I've implemented a plugin based on the idea of Vladimir to highlight keyword
related to contorl flow.
This plugin highlights the keywords: "return" and "thorw" in one color and
the keywords "break","continue" and "goto" in another color.
**Note: I didn't create special highlighers for this plugin and reused
existing ones, therefore changing the color of the Event idetifier and the
Constant identifier will change the colors of the plugin.