Improve Unicode/CJK automatic wrapping in TextBlockClient

[postyizhan]

• Add a Unicode-aware line wrapper based on BreakIterator.
• Support CJK text, mixed Chinese/English content, punctuation rules, long words, emoji, combining characters,surrogate pairs, and ZWJ sequences.
• Preserve Minecraft § formatting codes across soft-wrapped lines.
• Keep existing whitespace and hard-break behavior compatible.
• Reuse Minecraft and custom font width measurements through TextBlockClient.
• Add JUnit 4 coverage for Unicode, whitespace, formatting, emoji, and edge cases.