Could not find some imports on macOS.

Changes to character rigging. Also CMake now respects ini-config
structure (although in the future, the lib file should be used. Check
installation in CMake for macOS/*NIX).

Define separate package for config code.

Use path relative to server executable instead of current working
directory.

Use abstraction instead of using SDL dependencies.

Include _s wrappers for most standard function calls.

Ensure every config-backed subsystem can serialize/deserialize config in
a single consistent manner.

Remove symlinks and make codebase use common modules instead.

Database will be used for authentication.