refactor

remove the free function entirely. all allocators are now expected to
implement reset instead. I reallized I never ever want to free an
individual allocation ever again. The forever_allocator is a special
case wherEreset is a no-op. The arena allocator was deleted. It will be
replaced soon.

test_std_allocator.c

@@ -1,14 +1,12 @@
 #include <criterion/criterion.h>
 #include "cig.h"
 
-
+// TODO rename std to forever allocator
 Test(std_allocator, test) {
-    allocator_t this = allocator_stdlib();
+    allocator_t this = forever_allocator();
     void *ptr = allocator_alloc(this, 10);
     cr_assert(ptr != ((void *)0), "non null from malloc");
     void *new_ptr = allocator_resize(this, ptr, 1024*1024*500);
     cr_assert(new_ptr != ((void *)0), "non null from realloc");
     cr_assert(new_ptr != ptr, "realloc is not the same ptr as malloc");
-
-    allocator_free(this, new_ptr);
 }