Fix clang-format-vs to use characters position/count instead of the offset/length for Unicode Replacements

[김태석 via cfe-commits]

Internally view.TextBuffer use sequence of Unicode characters encoded using
UTF-16 and use characters position/count for manipulating text.

When formatting an ANSI text, Replacements offset/length is same with
position/count but not an Unicode.

So conversion needed.
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#include <iostream>
#include <string>

int main( int argc, char* argv[ ] )
{
	std::string helloworld = "안녕, 세상!";

	for( int i=0; i<3; ++i )
	{
		std::cout << helloworld << std::endl;
	}

	return 0;
}
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