8. Clean up / refactor the raygui code in main.cpp, that asks user for game mode. Instead of just having a giant blob of code in main.cpp, maybe split it into a function, or move it to another file. It should be easy to split it into a different function, since none of the functions take any specific parameters. The text box function, for example, only takes in the rectangle coordinates, and the text to display. I can move the code to a function, and then pass in any parameters that I need to pass in (I don't think I need to pass many parameters, though).
9. Allow the user to quit before the game actually starts i.e. while they are inputting the game mode.
10. Move 'timer.h' implementation functions to a 'timer.c' file (or 'timer.cpp', if you want to use OOP).
11. Add better error checking in check_server function in check_input.hpp (also, probably move it to a separate implementation file).
12. Add 'install' target to Meson, to allow the user to install the game. This should also copy the .so files to the right locations.
