tags.frame: handle scroll frames
apply.scrollFrame: stub out scroll frame
widgetMetaBuilder: add base config metatable
widgetMetaBuilder: add initialiser loading
apply.scrollFrame: add init function, logging
apply.scrollFrame: create a scrollbar and buttons on each instance
apply.button: implement Disable
apply.button: implement enable, enable button on init
apply.scrollFrame: bar is a slider, not a scrollBar
apply.slider: add type, implement setMinMaxValues, setValue
Merge branch 'widget-ctors'