Fixed some small errors
Added prints to find out where segfault is triggered
Little change in the main function of the node (used argument directly)
Fixed some warnings
Priority is now given to the Node to initialize the thread.In the main function of the node is a second loop to wait if all threads are terminated.
Changes in the core:-Fixed wrong pointer in struct and functions of core.-Geteventmask function returns correct eventmask.Changes in the node:-Sibling (and not only child of the thread) also terminate in the main function.-Initalizes thread in the init function.
Initialize thread in init function of the node
Add a getter function in the core for the event mask to check in the main function of the node if the core event is redefined
Made struct of core private and static and provided getter functions for the needed members
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