Expand characters temporarily skipped in spellchecking

An earlier patch (I4d09576a31df551c96f820242fd2cbc675506dae)
special-cased apostrophe as a character to defer spellchecking on,
since it could cause a word break which could later get removed.

This patch updates that earlier patch to include all characters that
could cause such a behavior according the Unicode word breaking
algorithm defined in UAX #29.

Bug: 17641350
Bug: 17673522
Test: manual
Change-Id: I4029e3d91dfcf96665b003f6fdd30d1208b0ac7c