Extract tests from source directory.

Ensure warnings have been accounted for.

Extract additional platform-specific imports to basic compatibility
header.

Properly declare shims for macOS.

Configure environment for Linux.

Server runs ok, the game runs but with no window...

Make server use standard output streams instead of file-based streams.

Add capability to log outside stderr and stdout.

Unify variables across the project.

Add context on all log items.

Make colored console output work in Windows.

Add modes for log mocks.

Put mocks to directory structure mimicking project structure.

Use abstraction instead of using SDL dependencies.

Add ws prefix for easy filtering.

Use our logging mechanism and remove dependency on SDL.

Come up with our own logging system.

Remove symlinks and make codebase use common modules instead.