Move to beginning anf end of lines uses screen lines

* Open a file with long lines
* Soft wrap 
* Hit end at the beginning of a long line

It moves to the end of the buffer line. Super frustrating. 

So the select to the end/beginning, and delete to end/beginning both use screen lines, but this uses buffer lines.

This pull removes the beginning / end of screenlines commands and moves the canonical commands to use screen lines. 
I think we can remove them then, I don't think we need to deprecate them.

I'd say just a mention in the release notes in case people have them remapped in their local keybindings and notice they aren't working anymore.