feature (#1)

This feature adds the following functions:

 - set_malloc()
 - set_free()

Which is a safe malloc wrapper, that frees all memory after a test has finished.

Reviewed-on: #1

include/list.h

@@ -0,0 +1,33 @@
+#include <stddef.h>
+
+struct SETBlockMeta
+{
+    struct SETBlockMeta *next;
+    struct SETBlockMeta *prev;
+    struct SETBlockMeta *end;
+};
+
+/**
+ * Adds a new element to the list. The MetaData should sit at the start
+ * of a block.
+ *
+ * head (SETBlockMeta) List head.
+ * next (SETBlockMeta) Next meta to append.
+ */
+void set_ll_append(struct SETBlockMeta *head, struct SETBlockMeta *next);
+
+/**
+ * Frees all blocks in the list.
+ *
+ * head (SETBlockMeta) List head.
+ */
+void set_ll_free_all(struct SETBlockMeta *head);
+
+/**
+ * Frees the block with the given address and returns the new head.
+ *
+ * head (SETBlockMeta) List head.
+ * address (void*) Address to free.
+ */
+
+struct SETBlockMeta *set_ll_free_one(struct SETBlockMeta *head, void *address);