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

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

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

Added goal number tracking to determine winning game.

Added new family of display functions that use ncurses along with tests

Added documentation to struct attributes in grid.h

Source and header files as well as Doxyfile are reorganized.

Added complete documentation to grid.h and player.c.

Added complete doxygen documentation to grid.c.

Renamed init_level subfunctions and updated enum CaseType structure.

Fixed display function bugs.

Added display functions and player related structures.

Filled blanks in file grid.c to add function which parses level file.