Plugins can no longer emit networkpackages for *every* device.
Plugins are stored in device, wich selectively loads them.
A Device is needed in order to instantiate a Plugin (via PluginLoader)
PluginLoader is a singleton, because every instance of Device need it.
Added KPluginSelector in the KCM to select the plugins to load.
Added architecture explanation to README
Only PingPlugin is working by now.
Device now has a public dbus interface
Removed wizard from kcm: now the main list shows all the devices and you can pair/unpair using a checkbox
Both Kde and Android now use unique device ids
