fix sanitizer to replace control characters with a question mark

[nschimme]

This fixes corrupted user maps with a "River Lh\x00n" room name.

Summary by Sourcery

Map ASCII control characters including NUL to the default unmapped character ('?') during sanitization and charset insertion.

Bug Fixes:

• Sanitizer now replaces NUL (and other control characters) with '?' in one-line, multiline, and word-wrapped output
• BasicCharsetInserter now maps ASCII control code points to the default unmapped character instead of passing them through

Tests:

• Add test_nul to verify NUL is replaced with '?' in sanitizeOneLine, sanitizeMultiline, and sanitizeWordWrapped

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