Added callback to be used to edit a button's "option-enabled" attribute by non-UserWrappr functions (#10)
Added callback to be used to edit a button's "option-enabled" attribute by non-UserWrappr functions (#10)

* Added callback to be used to edit a button's "option-enabled" attribute by non-UserWrappr functions

* Added void return type

FullScreenShenanigans/UserWrappr