Merge changes from 1.1 branch.
--HG-- rename : core/systems/ExtensionSys.cpp => core/ExtensionSys.cpp rename : core/systems/PluginSys.h => core/PluginSys.h
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--HG-- rename : core/systems/ExtensionSys.cpp => core/ExtensionSys.cpp rename : core/systems/PluginSys.h => core/PluginSys.h