Squashed 'libft/' changes from 3f97c0e..9b50a90

9b50a90 Merge header files
7adc89b Move libft internal code to ft_internal.h
08bf3b7 Optimisation
15032f4 t_tab storage and ft_tab functions
50c4ad5 ft_arraykilf
657b749 Terminate t_array by NULL
0aab506 Fix t_string not terminate by 0
ad71d22 Add ft_drawcirclef and fix drawrect

git-subtree-dir: libft
git-subtree-split: 9b50a902f54bfd4c5cbc1071f31800d84fc11ccf
Update libft
Nothing