Initial project import

tools/v/vlib/encoding/utf8/east_asian/east_asian_width_test.v

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+module east_asian
+
+fn test_width() {
+	assert east_asian_width_property_at('A', 0) == .narrow
+	assert east_asian_width_property_at('Ａ', 0) == .full
+	assert east_asian_width_property_at('ｱ', 0) == .half
+	assert east_asian_width_property_at('ア', 0) == .wide
+	assert east_asian_width_property_at('☆', 0) == .ambiguous
+	assert east_asian_width_property_at('ج', 0) == .neutral
+	assert display_width('abc', 1) == 3
+	assert display_width('ひらがな', 1) == 8
+	assert display_width('カタカナ', 1) == 8
+	assert display_width('ｶﾀｶﾅ', 1) == 4
+	assert display_width('한글', 1) == 4
+	assert display_width('한자', 1) == 4
+	assert display_width('漢字', 1) == 4
+	assert display_width('简体字', 1) == 6
+	assert display_width('繁體字', 1) == 6
+	assert display_width('अरबी लिपि', 1) == 9
+	assert display_width('☆', 1) == 1
+	assert display_width('☆', 2) == 2
+	assert display_width('🐈👽📛', 1) == 6
+}