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- engine_load/3/4 can be called multiple times for same engine
if it allows it (eg doesn't contain global data)
- ensure_engine_loaded/2/3 is new functions that guarantees that the engine
is just loaded once by adding it to OpenSSL internal engine list and check that
before loading.
- ensure_engine_unloaded/1/2 is new functions that is used to unload engines loaded with
ensure_engine_loaded (remove it from OpenSSL internal engine list and then unload).
- new utility functions engine_by_id/1, engine_add/1, engine_remove/1,
engine_get_id/1 and engine_get_name/1
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