Fixed crash in engine plugin loading (hopefully). I think it was caused by a defect in the boilerplate macro in plugin/plugin.h, which looked like this: void* create_plugin() { return new classname; }
but should really have returned an amaroK::Plugin* pointer. I think this could cause loss of type information. Still, it's beyond me why this worked on most systems, but on some it didn't.
* _Finally_ fixed the dreadful engine unloading bug! * Moved engineobserver.* to amarok/amarok. * don't link engine/plugin code to amarokapp, since that's nonsense. svn path=/trunk/kdeextragear-1/amarok/; revision=300680
Redesigned plugin framework to comply with KDE standards: * .desktop files are used to describe amaroK-plugins as services. * KTrader is used for searching plugins and querying properties. The advantage is that we can now use the powerful trader query language to search for a plugin that fits our needs. No need to reinvent the wheel. * It's possible to query plugins from the shell by using the little tool ktradertest. Very handy for quickly getting an overview once you have a lot of plugins installed.
Thanks go to Nikolas Zimmermann (wildfox@kde.org) for coming up with the idea.
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