Create 'Effect.js' Superclass

[ogbabydiesal]

derived classes would include effects such as Delay, Reverb, etc..

the benefit of this is that we can inherit methods such as wetdry() and amp()

[lvdopqt]

Hello again
I've started this change in this branch. I've created an effects folder and changed the import reference in the app entrypoint. For now I've just moved the connect/disconnect functions to this Effect.js superclass, but maybe it could be moved to a more generic "Node" superclass.
I didnt implement wetdry() and amp() or other functions for now, but the structure is ~ready for that.