Tutorial Prep Week 4

Refining the model scenery from week 2 with ground textures, trees etc. 

First items with the inbuilt features of Unity, then some finer operations and reshaping with the Terrain Tools package. Also changed the background skybox picture.

Later, tried the ProBuilder package for some basic buildings (extruding polys, bevels etc) and explored predefined shapes like stairs.

Struggled a bit with lighting, but reducing the amount of trees in addition to reducing detail helped significantly with rendering.