Add support for STL ASCII format

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (30a8ac5) 93.44% compared to head (5a31c9c) 94.06%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #41 +/- ## ========================================== + Coverage 93.44% 94.06% +0.62% ========================================== Files 12 13 +1 Lines 534 590 +56 ========================================== + Hits 499 555 +56 Misses 35 35 ```

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