Ensure warnings have been accounted for.

Only free memory that are dynamically allocated.

Use blank returns for subroutines.

Implement and fix list functions and their tests.

Convert list to doubly-linked list for easy traversal.

Use node pointers instead of duplicating the find function logic.

Make colored console output work in Windows.

Use abstraction instead of using SDL dependencies.

Instead of using macros, use iterators built-in on each list for
filtering and traversing.

Update initialization method.

Change the pool list initializations.

Add memory and data-related implementations for handling game data.