Add support for :set list! (toggle Editor > Show Invisibles)
Fix issue #330: it can't be build in Xcode46
Update README.md
Merge pull request #331 from pebble8888/xcode46patch

Fix issue #330: it can't be build in Xcode46
Added toggle XVim menu in "Edit" menu.
Close #279
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Merge pull request #328 from pdonelan/set-list

Add support for :set list! (toggle Editor > Show Invisibles)
Merge remote-tracking branch 'upstream/master'