Second part of cleaning up the lib directory: the effects library
now lives in libkwineffects/ directory.
For existing effects nothing changes as the install path is unchanged.
The change obsoletes the lib/ directory.
As glplatform.h has not yet been exported I dared to export it and
adjust the places where it is used.
CCMAIL: kwin@kde.org
should act just like Picture, except for proper initialization
and resource freeing (i.e. it's sane and easy from C++ point of view).
svn path=/trunk/KDE/kdebase/workspace/; revision=805085
