Added EffectFrame, a helper class that creates, manages and caches a Plasma frame object.
There are two ways to use this class: The first is in "static" mode which gives the frame a set geometry and will not change, the second is an automatic mode that creates the smallest possible frame around the specified contents.
Contents can either be normal text and/or a QPixmap, useful for displaying the caption and icon of the currently highlighed window.

Known:
- Does not detect Plasma theme changes, known to be in the Plasma library.
- Slight graphical glitches, known to be in Qt 4.5.0 RC1.

Untested:
- What happens when there is no Plasma theme installed.