only validate the edges and features of a text frame

[olivetthered]

instead of validating every glyph with the layout only validate those at the edges and features of a text frame. thease are the structural points of the layout framework and it should speed things up a good deal if we don't have to verify the majority of the glyphs.

[olivetthered]

updating settings from the glyph that lies on the last line width of the text area. needs fuzzy validation to be implemented properly still.