Finish Chapter 14

Implements code chunks, a couple of basic opcodes, constants, and
basic execution of those opcodes.

Signed-off-by: Daniel Henry <iamdanhenry@gmail.com>

include/memory.h

@@ -0,0 +1,15 @@
+#ifndef clox_memory_h
+#define clox_memory_h
+
+#include "common.h"
+
+#define GROW_CAPACITY(capacity) ((capacity) < 8 ? 8 : (capacity) * 2)
+#define GROW_ARRAY(type, pointer, oldCount, newCount)                          \
+  (type *)reallocate(pointer, sizeof(type) * (oldCount),                       \
+                     sizeof(type) * (newCount))
+#define FREE_ARRAY(type, pointer, oldCount)                                    \
+  reallocate(pointer, sizeof(type) * oldCount, 0);
+
+void *reallocate(void *pointer, size_t oldSize, size_t newSize);
+
+#endif /* clox_memory_h */