don't load plugins more than once.  also, do moveToThread(0) on them
don't load plugins more than once.  also, do moveToThread(0) on them

svn path=/trunk/kdesupport/qca/; revision=439535

oktavarium/qca,oktavarium/qca,highfidelity/qca,Bjoe/qca,karolherbst/qca,Esf-Software/qca,JoshuaKolden/qca,JoshuaKolden/qca,oktavarium/qca,KDE/qca,karolherbst/qca,JoshuaKolden/qca,KDE/qca,KDE/qca,Bjoe/qca,oktavarium/qca,Esf-Software/qca,Esf-Software/qca,JoshuaKolden/qca,sladage/qca,highfidelity/qca,sladage/qca,highfidelity/qca,KDE/qca,sladage/qca,Bjoe/qca,karolherbst/qca,Esf-Software/qca,karolherbst/qca,Bjoe/qca,sladage/qca,highfidelity/qca