gfc_list - sort

[engineerOfLies]

add a sorting function that will take a function pointer to resolve ordering
int gfc_list_sort_func(void *a, void *b);
should return 1, 0, or -1 depending on sorting order (ala strcmp).
void gfc_list_sort(GFC_List *list, int (*gfc_list_sort_func)(void *a, void *b));

[engineerOfLies]

use merge sort, the elemetns are all pointers anyway

[engineerOfLies]

gfc_list_sort() works