USER32: Implement SPI_SETICONMETRICS

[jchevrier at nexicom.net]

Changelog:

*Implement SPI_SETICONMETRICS. Like MINIMIZEDMETRICS these values only apply 
to the current session and are lost on reboot. Confirmed on Win XP and 98.
*Added ANSI to Unicode conversion for SPI_SETICONMETRICS when called from 
SystemParametersInfoA.
*Fixed SPI_GETICONTITLELOGFONT to only return values retrieved from win.ini on 
first call and return a cached version in subsequent calls. This allows us to 
call SPI_SETICONMETRIC and have the value set there returned by calling 
SPI_GETICONTITLELOGFONT instead of always returning the value set in win.ini. 
Confirmed on Win XP and 98. Going to gain speed on this call too.
*Created unit test for SPI_{GET,SET}ICONMETRICS. Passes under: Wine, WinXP and 
Win98.
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