Make movement and deletion grapheme-aware#44
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`GoToPrevChar`, `GoToNextChar`, `DeletePrevChar`, and `DeleteNextChar` now step one grapheme at a time instead of one codepoint. This fixes backspace and arrow key behavior for combining marks, emoji with skin tone, ZWJ sequences, and national flags, where a single user-perceived character (grapheme) spans multiple codepoints. `cursor()` still returns a codepoint count to preserve the public API, so a single backspace that deletes a multi-codepoint grapheme may decrease cursor position by more than one. Similarly, a single cursor movement command may move the cursor by more than one codepoint.
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GoToPrevChar,GoToNextChar,DeletePrevChar, andDeleteNextCharnow step one grapheme at a time instead of one codepoint. This fixes backspace and arrow key behavior for combining marks, emoji with skin tone, ZWJ sequences, and national flags, where a single user-perceived character (grapheme) spans multiple codepoints.cursor()still returns a codepoint count to preserve the public API, so a single backspace that deletes a multi-codepoint grapheme may decrease cursor position by more than one. Similarly, a single cursor movement command may move the cursor by more than one codepoint.