[interfacekit] FreeType2 and font cache

Like for us, people at SkyOS use FreeType to render fonts. Here's an avice
from Robert that we probably best to take in consideration (sorry if it was
already planned ;-)

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Update on February 26, 2002 by Robert Szeleney:
Huge SkyGI performance increase. As you may know, the graphical user
interface of SkyOS uses FreeType2 for truetype support. With this library,
rendering 255 characters (20x20, Arial) needs about 680ms on a P200.
So I decided to implement a FontCache. With this fontcache, the same 255
characters are renderd in 15ms now.

If you ever plan to implement FreeType2 in your OS, implement a Font-Cache
too. You will get a factor 40 performance increase .
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