Changelog

Removed pauseOnVisibilityChangein favor of pauseOnFocusLoss:
Pause the toast timer when the window loses focus. This behavior can be defined per toast. Usage here
Deleted a bunch of useless code
Fix draggablePercent check
When the ToastContainer is unmounted, the toast id counter is reset to 0 and all the reference are cleaned up.
Add union type for position in typescript definition
Upgrade to latest version of react-transition-group
Upgrade to latest version of classnames

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