More font style work;
- hooked up almost all ui buttons code to new font
system, including text clipping
- panel headers scale now too to smaller fonts
- added further style hints, for shadow/emboss. Is all going to
be in UI designer control!
- for fun; changed layout engine to spread vertical buttons in
window width
Next: removal of all usage of old font system, using 'styles'.
Will also move font blurring to blenfont module.
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