Create static timer instance for UAVO browser highlights.

This single timer sets the rhythm for all highlight events. Previously each class instance has its own timer and this led to lots of expensives and unnecessary calls to QTime::currenttime();

![screen shot 2013-05-20 at 3 42 12 pm](https://f.cloud.github.com/assets/1118185/536357/4efc1fb0-c153-11e2-87a5-58781f86b156.png)