Backrooms Mobs

Adds two new entities:

- Entity 8, Hound. The doggy wants a pet! Will roam around sniffing in search of the wanderer. Upon sight, it will either bite or swat at the wanderer in order to eat them for dinner. 
- Entity 16, Nguithr'xurh. The Sleeper Spider. This cute little pet has 16 legs. It will seek out a wanderer whilst roaming. While a bite from this spider is rare and not deadly, it can cause severe nausea and poison leading to another entity encounter being more dangerous. Be cautious as this spider is known to trap its victims and climb walls to pursuit anything it sees. 

Makes some changes:

- Entity 38, Humanoid. Replaced the purple variant with an actual static variant to be more lore accurate. It still glows in the dark on both normal and VV gamemodes. 
- Entity 5, Clump. Changed the model and texture to be more consistant with the art style. Changed its behavior to spawn in 23 different sizes, each one being gradually larger than the next. It will also grow to the next largest size upon killing another entity or wanderer to simulate it growing larger adding more body parts. Will attack all entities that are not clumps. 

Technical changes for code sourcing: 

- Entity 3, Smiler. Cleaned up its behavior code to be more readable for sourcing. 

Credits:
nohnmann - Lead on models, textures, and animations for new mobs