[Author: thomasvl]
[Author: thomasvl]

Put the padding tweak in to the NSMatrix path also for wrapped strings
  since they can have the same problems as standalong radio/checkboxes.
The padding amount also is increased slightly to handle Kerning that can
  happen on some european languages (accent chars).
Move some constants into global constants in the file for general cleanup.

R=dmaclach,stuartmorgan
DELTA=36  (26 added, 8 deleted, 2 changed)

git-svn-id: de279663232b6350d3cffc59c8efba27ad613299@321 7dc7ac4e-7543-0410-b95c-c1676fc8e2a3

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