Adding KFontUtils to kdeui

[Albert Astals Cid]

Hi, this is a mail asking for the moving of KFontUtils from libkdeedu to 
kdelibs since 5 programs in kdegames are already using copies of it (some old 
copies)

The code that will be commited is attached.

A better name for the function is welcome

The rational of this helper method is that QFontMetrics is a good try but it 
really fails when you need pixel perfection.

Since the code is small and already used in lots of places, Allen agreed i can 
commit it to kdelibs on Monday if noone objects.

Albert


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