Added prefabs/staging area

Added building prefabs/ set up the rough area of the level.
Revert "Added prefabs/staging area"

This reverts commit 4aa448e65d2e37974240d49c7df3655316ce5e0c.
Revert "Revert "Added prefabs/staging area""

This reverts commit eb3315cd72756bc6306ce614f053db6bdd5c1d28.
Deleted Skybox