Add support for BMTUN

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.14% :tada:

Comparison is base (f426b8f) 73.11% compared to head (c52feaf) 73.25%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #80 +/- ## ========================================== + Coverage 73.11% 73.25% +0.14% ========================================== Files 56 57 +1 Lines 3028 3044 +16 ========================================== + Hits 2214 2230 +16 Misses 814 814 ``` | [Files Changed](https://app.codecov.io/gh/randovania/mercury-engine-data-structures/pull/80?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=randovania) | Coverage Δ | | |---|---|---| | [...mercury\_engine\_data\_structures/formats/\_\_init\_\_.py](https://app.codecov.io/gh/randovania/mercury-engine-data-structures/pull/80?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=randovania#diff-c3JjL21lcmN1cnlfZW5naW5lX2RhdGFfc3RydWN0dXJlcy9mb3JtYXRzL19faW5pdF9fLnB5) | `100.00% <100.00%> (ø)` | | | [...rc/mercury\_engine\_data\_structures/formats/bmtun.py](https://app.codecov.io/gh/randovania/mercury-engine-data-structures/pull/80?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=randovania#diff-c3JjL21lcmN1cnlfZW5naW5lX2RhdGFfc3RydWN0dXJlcy9mb3JtYXRzL2JtdHVuLnB5) | `100.00% <100.00%> (ø)` | |

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[ThanatosGit]

Actually...should I keep "remaining" / construct.Peek(construct.GreedyBytes), or remove it? There is nothing in the remaining bytes which is good but dont' know if we keep it there for "safety".

[henriquegemignani]

Define "which is good"? Is the remaining data just padding that got accidentally included in the file itself? Or is data we don't need for our purposes?

[ThanatosGit]

Oops, I meant there is nothing in the remaining bytes, so it has zero length and zero bytes in it, which is a good thing if you parse files.

[henriquegemignani]

Then replace it with a Terminated.

[ThanatosGit]

Then replace it with a Terminated.

done