Venture Adventure - Small refactor (part 2)

[MHLoppy]

Description

While getting working on Venture Adventure again, I felt like there was low-hanging fruit available to refactor that would make future work easier. I've split this work into several parts of related changes to make for smaller PRs that are easier to review.

This is part 2/5 (building on the previous changes made in the chain) and is focused on improving the way levels are tracked to require less variables.

Type of change

• Other: refactor

How Has This Been Tested?

I recompiled the game and played through it, ensuring that all refactored functionality threw no errors and worked the same as pre-refactor.

Testing Checklist

• Played through all of level 1
• Played through all of level 2
• Played start of level 1 after cycling through main menu after completing both level 1 + level 2

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I'll notify my team when the PR is ready to review

[MHLoppy]

Superceded by #228 after merge conflicts

[AmberPotion]

Cool