libakonadi-kde: remove almost all uses of QList<T> where sizeof(T) > sizeof(void*).

The remaining ones are needed due to KConfig only supporting QList and one exposure in the public API.
Also added some Q_DECLARE_TYPEINFOs so's QList<> can generate faster code.

svn path=/trunk/KDE/kdepimlibs/; revision=1146661