#108 Toolbar buttons need ~2px horizontal padding in OS X

[John Lianoglou]

Because OS X's Aqua-simulating Swing PLAF seems to insist on
drawing gel cap style bevel borders around the toolbar buttons, the
icons (and button text, when present) seem crowded in.

[t_magicthize]

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Can you provide some screenshots, ive yet even to see
Gruntspud even running on this platform!