Embed TR2X SFX

#### Checklist - [x] I have read the [coding conventions](https://github.com/LostArtefacts/TR-Rando/blob/master/CONTRIBUTING.md#coding-conventions) - [x] I have read the [testing guidelines](https://github.com/LostArtefacts/TR-Rando/blob/master/CONTRIBUTING.md#testing-guidelines) - [x] I have added a changelog entry about what my pull request accomplishes, or it is an internal change #### Description Updates level IO to handle embedded TRX injection data. This allows us to break away from `main.sfx` by embedding the samples inside each level, which in turn means completely free SFX randomization, and also allows for barefoot SFX when Lara's costume has changed to either the diving suit or HSH robe.