Workflow:
1 - Create your road network (manual for now)
2 - Lay down your zones
3 - Spawn your buildings and adjust
4 - Convert buildings into HISMs
5 - Setup your foliage settings and spawners
6 - Spawn foliage and adjust
7 - Convert foliage into HISMs
8 - Spawn props (not implemented)
9 - Final scene adjustments and testing...