Scroll frame

Created a component for embedding frames containing widgets, with scrolling taken care of.
See the demo! A picture's worth a thousand words and all.
The "TfpgAutoSizingFrame" uses the TComponent.Components property to loop through all its children and determine its size, so we can size the scrollbars properly.
Issues:
- Haven't set up scrollwheel events yet for the scrollbars
- Perhaps I should have looked for TfpgWidgets instead of TfpgWindows so we can also check .Visible for sizing?