Cursor keys support.
Support <C-f>, <C-b> and some special keys.
Keep cursor position after yy.
More digraphs.
Added two new tests.
Fix block paste near the last line.
Expose digraph table in config.
Make undo behave more like in vim (but not quite there yet).
Fix error on :<CR>
Delete some unused code from Yi.Keymap
Implement some missing pieces in Ex command editing.