spdlog requires define guards on every use

[Enriquefft]

https://github.com/Enriquefft/cpp-template/blob/ee881bf74d2dff901ef899cce30b8fac8fe3673f/src/main.cpp#L5C1-L15C7

Spdlog requires window.h if used on a Windows build, that header has many common function names which conflict with Raylib. (raysan5/raylib#1217)

The current solution is to wrap spdlog includes with define guards, as proposed in raysan5/raylib#1217 (comment).

It would be nice if this was made into its own module.