word-wrap setting should be stored by filetype

[stefankueng]

from #376: Wordwrap setting is not persistent between sessions. If I set Wordwrap to OFF for any file (like a ,txt file), next time I open the file Wordpwrap is ON. Ideally the Wordwrap setting should be persistent for each filetype. Not sure if other settings are not persistent, but they should be, since there aren't actual settings besides what's on the ribbons.