New feature - implement disabled status on button

[elijaholmos]

In the next version of Spicetify there will be an option to toggle the enabled/disabled status of ContextMenu Items.
See spicetify/spicetify-cli#520

Once this is released, implement a feature where the VPWS button appears during the setup phase but cannot be clicked until the setup phase is complete and the user's entire library has been documented.