Safe Multiple SystemEffects

[SrMouraSilva]

Maybe the user use more than one SystemEffect

https://gist.github.com/dcoredump/6037ad2224ed4755d1438b2a7e75d74a#file-pedalpy-py-L8-L22

• PersistenceDecoder.__init__(system_effect) -> PersistenceDecoder.__init__(system_effects)
• Autosaver.load(system_effect) -> Autosaver.load(system_effects)