Toolbar: Rework and Document the Way the Internal Area of Buttons are Layed Out

[Robert Shearman]

Changelog:
- Document how the native lays out the internal components of buttons.
- Fix control to follow these rules.
- Don't redraw disabled buttons.
- Padding is never less that GetSystemMetrics(SM_{CX,CY}EDGE).
- Change default iListGap value to 4 to match native.

-- 
Rob Shearman

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