Adds a test to verify the consistency of world-to-screen and
screen-to-world projections. This ensures that projecting a point
from world to screen and back results in the same point, thereby
validating the correctness of the camera projection transformations.
Adds functionality to convert screen coordinates to world space, including handling for cases where the inverse view projection matrix is singular or when the world position is out of screen bounds.
Also exposes Camera class to unit tests.
Updates unit tests to include more accurate assertions for camera projections.
Adds .idea/workspace.xml to .gitignore to prevent tracking local IDE settings.
Refactors some test fixture class names for consistency.
