Fix horizontal cursor movements when there are grapheme clusters #15
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Currently the cursor goes haywire when the input contains grapheme clusters such as multi-codepoint emojis eg. 🇵🇱, 🙆🏿♂️
The same goes for deletion, backspace only deletes one rune, so to delete a flag emoji the backspace key has to be pressed twice.
This PR aims to resolve this issue by taking grapheme clusters into account in these scenarios.