Added GitLab CI/CD pipeline to generate the documentation for the
latest version on main and publish it on GitLab Pages automatically.

Updated todos according to advances made.

Added compiler option to specify C standard for the project.

Added new file to keep track of project goals.

As own SDL2 library is phased out, deleted related ignore entries.

Got rid of own SDL2 library, project depends on system installed one.

Added GPLv3-or-later license to project.

Added how to play and license info to README.md

Added larger version of project logo in images directory.

Added new license in COPYING and added copyright notices to files.

Bumped version number in doc to 1.1.1

Added doxygen dependencies to README.md generating doc section

Changed doxygen options and added logo to doc

Added dependencies to README.md and made more readable.

Fixed newline issue on error messages and mapped new key for SDL.

Bumped version number in Doxyfile for new release.

Updated README.md by adding more descriptive install instructions.

Added documentation to function pointers in grid.h.

Structured main.c for better modularity, less repetition.

Simplified and structured move_player() function for less repetition.

Added new function to be called at any program exit situation.

Changed display_sdl2() function to draw differently, no more weird borders.

Added keyrepeat to SDL2 display method, (h, j, k, l) keys also added.

Updated README.md with newer information about new release.

Updated version number in Doxyfile to reflect new release.

Added new gifs to reflect the functioning of the new release.

Added SDL2 installation clean rule to makefile, updated cleanall.

Added main function parameter explanations in documentation.

Added command line argument parsing and implemented two display methods.

Added new tests for command line argument parsing.

Added documentation and commentary to new struct in grid.h.

Formatted files to match project syntax and added documentation.

Added SDL2 graphics, event handlers into the game loop.

Added tests for new display, event functions.

Added new display method with SDL2 library, event system, refactoring.

Simplified .gitignore by removing unnecessary lines.

Fixed SDLContext global variable scope in sdl2.c and sdl2.h.