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This modification makes it possible to initialize a context in such a way that a `void *` pointer is stored inside the context and is made available via a new `jerry_get_user_context()` API. The pointer is initialized via a new `jerry_init_with_user_context()` API, which calls the existing `jerry_init()`, after which it sets the value of the new `user_context` element in the `jerry_context_t` structure using the context allocation callback provided as the second parameter to the new `jerry_init_with_user_context()` API. The location of the cleanup function responsible for deallocating the pointer created by the context allocation callback is provided as the third parameter. This location is stored in the context along with the pointer itself. When a context is discarded via `jerry_cleanup()`, the user context cleanup function is called to dispose of the pointer stored within the context. The semantics behind the API are such that it is now possible to choose for each context an agent which manages arbitrary user data keyed to the given context. The agent must be chosen at context instantiation time and cannot be changed afterwards, remaining in effect for the lifetime of the context. Fixes #1717 JerryScript-DCO-1.0-Signed-off-by: Gabriel Schulhof gabriel.schulhof@intel.com