FieldEnvironment Redesign + Collision updates

-Further changes listed in ChangeLog.md-

-Ground planes overtop of each other within the height of the player now act like a wall/obstacle
-Jumping + stair/hills check stacked colliders for better delegation of which collider should be stood on

-Field Environment is now a lake environment, revamped the environment, colliders, textures, objects, and more.  Shaders for the lake and creek need more love.

Author: ProcStack