[CTX] [ALL] Data conversion

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Data conversion

Parameters to control built-in converter for text type data.

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*	CHARCODE	JIS|EUC|SJIS|UTF8	character conversion for Japanese text
*	CHARMAP	[jis|ucs]:a-z/A-Z	map character to character in text data
	HTMLCONV	deent|enent|pre	decode/encode between HTML & plain text
	MIMECONV	thru|charcode	control MIME encoder/decoder

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