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Add new `libssh2_session_callback_set2()` API that deprecates `libssh2_session_callback_set()`. The new implementation offers the same functionality, but accepts and returns a generic function pointer (of type `libssh2_cb_generic *`), as opposed to the old function that used data pointers (`void *`). The new solution thus avoids data to function (and vice versa) pointer conversions, which has undefined behaviour in standard C. About the name: It seems the `*2` suffix was used in the past for replacement functions for deprecated ones. Let's stick with that. `*_ex` was preferred for new functions that extend existing ones with new features. Closes #1285