Update 0.6

- Implemented slugs
- Implemented crustaceans
- Implemented horseshoe crabs
- Implemented area based biomes
- Vivarium tab has been added
- Vivarium lid model (Default) added
- Vivarium rims model (Brass) added
- Vivarium stand models (CRT, Industrial Wood) added
- Animals pathing and motion can be now groundbound
- Tank lid, rims and stand can be now changed or disabled
- Flatworms can now evolve into slugs, horseshoe crabs and crustaceans
- Ground and background colors can be now set with hex values in alt-click menu
- Fixed bloating size of save state file over time
- Fixed plants not interacting with cursor at acute camera angles
- Fixed vivarium not interacting if loaded from save state select screen
- Fixed side reflections bottom edges flickering at acute camera angles
- Optimized plants object management by translating transforms without parenting
- Optimized plants object pooling by more aggressive grown nodes disabling
- Optimized mesh data management by utilizing array instead of dictionary
- Improved fishes and flatworms textures
- Improved interface scaling for 4:3 and custom screen ratios
- Refactored tank generation menu to support new features and live previews
- Refactored vivarium meshes, materials and transforms into discrete class