[MISC] Separate parsing the layout header and building the build-tree.

[smehringer]

This is part of making the building independent of whether I give it a file or the layout data structure itself.

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Name	Status	Preview	Comments	Updated (UTC)
raptor	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 9, 2023 10:22am

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (34cdf6d) 100.00% compared to head (40f3df7) 100.00%.

:exclamation: Current head 40f3df7 differs from pull request most recent head b9fef52. Consider uploading reports for the commit b9fef52 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #313 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 63 64 +1 Lines 2145 2166 +21 ========================================= + Hits 2145 2166 +21 ``` | [Impacted Files](https://app.codecov.io/gh/seqan/raptor/pull/313?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=seqan) | Coverage Δ | | |---|---|---| | [src/build/hibf/initialise\_build\_tree.cpp](https://app.codecov.io/gh/seqan/raptor/pull/313?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=seqan#diff-c3JjL2J1aWxkL2hpYmYvaW5pdGlhbGlzZV9idWlsZF90cmVlLmNwcA==) | `100.00% <100.00%> (ø)` | | | [src/build/hibf/parse\_chopper\_pack\_header.cpp](https://app.codecov.io/gh/seqan/raptor/pull/313?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=seqan#diff-c3JjL2J1aWxkL2hpYmYvcGFyc2VfY2hvcHBlcl9wYWNrX2hlYWRlci5jcHA=) | `100.00% <100.00%> (ø)` | | | [src/build/hibf/read\_chopper\_pack\_file.cpp](https://app.codecov.io/gh/seqan/raptor/pull/313?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=seqan#diff-c3JjL2J1aWxkL2hpYmYvcmVhZF9jaG9wcGVyX3BhY2tfZmlsZS5jcHA=) | `100.00% <100.00%> (ø)` | | ... and [4 files with indirect coverage changes](https://app.codecov.io/gh/seqan/raptor/pull/313/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=seqan)

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