Key navigation

I am about the enhance the key navigation support. Shown below is
the list of changes I plan to make. Part of those changes is that
I will eliminate the HomeEndKeyBehavior design time property and
go with what is shown below for the home end keys. This should
make for a more conistent set of functionality across platforms.
If you have any comments or any suggestions for key combinations I
am missing, let me know. My goal is to have all the possible
navigation key combinations implemented in version 1.3.

home: Jumps to the beginning of the line.

end: Jumps to the end of the line.

shift-home: Selects to the beginning of the line.

shift-end: Selects to the end of the line.

option-home: Jumps to the beginning of the document.

option-end: Jumps to the end of the document.

option-shift-home: Selects to the beginning of the document.

option-shift-end: Selects to the end of the document.

option-delete: Deletes the word proceeding the insertion caret. If
the insertion caret is in the middle of a word, it deletes the
first half of the word.

option-forward delete: Deletes the word proceeding the insertion
caret. If the insertion caret is in the middle of a word, it
deletes the last half of the word.

FTC Website: 
http://www.truenorthsoftware.com/FormattedTextControl/FormattedTextControl.html
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