Add support for NodeList in register/unregister/reactivate

[spaansba]

Fixes #66

For backwards compatibility its still called element even though it now also accepts NodeList

• Add NodeList support to element in ForesightManager.instance.register()
• Add NodeList support to element in ForesightManager.instance.unregister()
• Add NodeList support to element in ForesightManager.instance.reactivate()
• Changed ForesightManager.instance.register() return type to ForesightRegisterResult | ForesightRegisterResult[] based on if element is a single element or a NodeList
• callback in ForesightManager.instance.register() now has a ForesightElementData parameter so you know which element's callback is being activated and how
• Exported ForesightCallback type since its now not empty

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[spaansba]

@jlukic is this what you were looking for?

[jlukic]

Yes looks great, thanks for the addition