Update to Plugin 0.6.2

-moved core functionality from the delegate into the plugin, Slate is no
longer a required dependency for C++ project extension
-all data is now created and deleted from the plugin, delegates hold
pointers to this data.
-cleanup of C++ requiring less code to extend a class. See example
actor/controller for updated implementation style.
-call HydraStartup() and HydraTick(float) instead of directly calling
the plugin, IHydraPlugin dependency removed from classes.
-added integrated angular velocity to data structure, events, and
function calls