MSR - Support .bmsmd

[dyceron]

I'm not sure what most of these unknowns are and I don't know if all the data types in sub_scenarios is 100% correct.

[codecov[bot]]

Codecov Report

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

Comparison is base (9f37014) 73.84% compared to head (b913f01) 73.94%. Report is 4 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #97 +/- ## ========================================== + Coverage 73.84% 73.94% +0.10% ========================================== Files 60 61 +1 Lines 3101 3113 +12 ========================================== + Hits 2290 2302 +12 Misses 811 811 ``` | [Files](https://app.codecov.io/gh/randovania/mercury-engine-data-structures/pull/97?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/97?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/bmsmd.py](https://app.codecov.io/gh/randovania/mercury-engine-data-structures/pull/97?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=randovania#diff-c3JjL21lcmN1cnlfZW5naW5lX2RhdGFfc3RydWN0dXJlcy9mb3JtYXRzL2Jtc21kLnB5) | `100.00% <100.00%> (ø)` | |

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