Add sprite texture position mapping

Resolves #844. #### 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 On data import, object texture positions are mapped so texture monitoring can reference the positions, but sprite textures were missed in this logic. This meant that sprites such as the flames couldn't be targeted for texture randomization in levels such as Venice where they don't already exist.