Version 1.9c
* Fix crashes caused by PluginController
* Only load PluginController if enabled
* PluginController works reliable now
* Support unloaded/vanished plugins
* Do not restore Activity with Feedback Dialog
* Fix problem with InetAddress.getByName in gui thread
* Send broadcast packets to all network interfaces
* Show better error messages if network is not reachable
* Query existing devices only, if network does not support broadcasts (2G, 3G)