danvk / source-map-explorer / 326

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Fix slowness (#158)

- Remove useless false-positive check for source map referencing EOL. Creating string with the length of the file on each iteration greatly decrease performance
- Disable check for invalid mapping column until #136 is fixed
- Update `InvalidMappingColumn` error message - add 1 to `generatedColumn` to count columns from 1 to conform with `contains ${maxColumn} column(s)` phrase
- Reduce usage of `map-reference-eol.js` in tests
- Generate `invalid-map-column.js` and `invalid-map-line.js` without `tsc` to eliminate source map referencing EOL

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