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_arena_allocator.c

@@ -1,41 +0,0 @@
-#include <criterion/criterion.h>
-#include "cig.h"
-#include <stdio.h>
-
-Test(arena_allocator, repeated_allocations) {
-    arena_allocator_t aalloc = arena_allocator_create();
-
-    for ( int i = 0; i < 10; i++ ) with_arena(&aalloc, allocator) {
-        allocator_alloc(allocator, 10);
-    }
-
-    cr_assert_eq(aalloc.to_allocate, 10);
-    cr_assert_eq(borrow_allocator_count_allocations(&aalloc.borrow_allocator), 0);
-    cr_assert_eq(dyn_array_capacity(aalloc.bytes), 10);
-
-    arena_allocator_destroy(&aalloc);
-    cr_assert_eq(aalloc.to_allocate, 0);
-}
-
-Test(arena_allocator, alignment) {
-    arena_allocator_t aalloc = arena_allocator_create();
-
-    for ( int i = 0; i < 10; i++ ) with_arena(&aalloc, allocator) {
-        allocator_alloc(allocator, 1000);
-    }
-
-	with_arena(&aalloc, allocator) {
-		size_t prev_addr = 0;
-		prev_addr = ~prev_addr;
-		for (int i = 0; i < 1001; i++) {
-			size_t addr = (size_t)allocator_alloc(allocator, 1);
-			cr_assert_neq(addr, prev_addr);
-			cr_assert_eq(addr % MAX_ALIGN, 0);
-		}
-	}
-	arena_allocator_reset(&aalloc);
-	fprintf(stderr, "%zu\n", aalloc.to_allocate);
-    cr_assert_eq(aalloc.to_allocate, MAX_ALIGN *  1000 + 1);
-}
-
-// TODO somehow test reallocations