refactor: move o.t.benchmarks back in to main source set
refactor: move o.t.benchmarks back in to main source set

Merge pull request #4021 from MovingBlocks/refactor/engine-dev
Malanius/Terasology,MovingBlocks/Terasology,MovingBlocks/Terasology,Nanoware/Terasology,Nanoware/Terasology,Nanoware/Terasology,Malanius/Terasology,MovingBlocks/Terasology