Plugins and google calendar

First:
We started to implement the plugininterface and also some example plugins. Not everything is done atm but there are at least two OutputPlugins and two UIPlugins in cvs module X4XPlugins. Next release will add the plugininterface to X4X.

Second:
We started some google calendar, check it out via google calendar search. We'll document the development there. Maybe it's interesting ;)