Rsx++ 1.21

bugfix release ^^

** RSX++ 1.21 ** 14/04/2011
** fixed some old tickets reported on trac
** fixed multithreading issues with plugins
** added some features to PluginSDK

Problems whit:
ShakesPeer 0.9.11
AirDC++ 1.8
DC++/FulDC 0.698
DC++/FulDC 0.699

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