Add support for Unfinished Business

[lahm86]

Resolves #579.

Checklist

• I have read the coding conventions
• I have read the testing guidelines
• I have added a changelog entry about what my pull request accomplishes, or it is an internal change

Description

This is largely a data PR for the TRUB levels, but there have been a few key changes in the code to support this, and to add further enhancements.

• Game Mode is now available (for TR1 only) to allow picking the original level set, the gold levels, or to combine them into a single gameplay. Most of the work is in TRGE, and in the randomizer adjustments were mainly needed in the UI and controller classes.
• FDControl has undergone a refactor because the TRUB level files seem to have been compiled with aggressive floor data packing, and our library wasn't configured to handle this. I've also removed a lot of the duplication in this class so it's easier to manage.
• Lara's gym outfit is no longer restricted to levels that already contain the model - we will import it where needed. The only time it cannot be used now is when a T-Rex is present, due to the mesh swap with Lara's model there. There is also a gold touch gym outfit, so it can even appear in Midas now.
• There are a few new and updated environment functions to match some of the changes we make in TRUB. This includes the ability to specify alias priority when importing models for environment mods - for example, importing the Midas hand for trap rando needs to ensure the associated LaraMiscAnim model is also imported, regardless of whether or not a different alias is already in the level.
• The option for allowing enemies to drop keys has been updated to take into account scenarios when you randomize enemies but not items. This means you can convert default key drops such as Pierre's into regular pickups if, for example, you are attempting a pacifist challenge (thanks to @eycore1 for highlighting this).
• Secret reward allocation is now fairer, so the player should feel properly rewarded for their efforts. This came about as there is only one default reward item in The Hive, but the level could potentially have five secrets.

All that should remain for full TRUB support is text translation - the current entries are effectively placeholders, so whichever language is chosen, the randomizer will fall back to these English defaults for the time being.

[lahm86]

There have been a few bugs identified and fixed after testing, so I think this is good for review now.
I've pre-squashed a few commits already, I'm not decided yet on doing a full squash on merge as there is quite a lot. I might do some further squashing after review for similar groups of files.