Support wide characters in terminals #535
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This PR adds support for wide characters (unicode characters that take up more than one cursor cell): eg. Eastern Asian characters and emojis.
It also removes the hack we previously had in order to subvert this issue (re-rendering all panes if there was one pane with a wide character). This also very slightly improves performance (since we don't have to loop through all characters in all panes looking for a wide character on every render).