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Adds references and pointers for variables.

Authors and contributors to this community extension: arthuro555.


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Adds actions to use references (variable that redirect any read/write to another variable) and pointers (unique numbers identifying a variable that can be resolved to a reference). Some usages are for callback variables in events based functions (getting a variable with a fixed name referring to a variable with a name passed as parameter), pointers to make advanced data structures like linked lists, and getting a top level variable dynamically.


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