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Сalculate sourceMappingURL size (#133)

- Add API `excludeSourceMapComment` option and `exclude-source-map` CLI parameter to  exclude sourceMappingURL comment from size analysis
- Rename `<unmapped>` to `[unmapped]`. Using `<>` in HTML output cause wrong title `&lt;`
- Export `UNMAPPED_KEY` `SOURCE_MAP_COMMENT_KEY` from index.ts so that these virtual files can be found among `files` object properties
- Improve size analysis accuracy. Calculate sourceMappingURL comment and EOL bytes. Use `Buffer.byteLength` to get string length in bytes. UTF-8 encoding is assumed. We can add encoding detection later if needed, but it isn't an easy thing to do.
- Add some tests

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