Add ainedit utility

The ainedit utility is a tool capable of modifying AIN files up to
version 12 (Rance X). As far as I know, this is the first publicly
released tool that can handle AIN files above version 7.

The basic mode of operation is as follows:

* dump the CODE section with aindump
* edit the disassembled bytecode
* assemble & insert the edited bytebode back into the original AIN file
  using ainedit

E.g.

    aindump -c -o out.jam /path/to/Rance10.ain
    $EDITOR out.jam
    ainedit -c out.jam -o out.ain /path/to/Rance10.ain
    mv /path/to/Rance10.ain /path/to/Rance10.ain.backup
    mv out.ain /path/to/Rance10.ain

ainedit is also capable of editing declarations (structures, functions,
etc.) using the JSON (-j) output from aindump.

There is currently one major deficiency in this tool: it does not
rebuild the AIN file's switch table (SWI0 section). This means that you
can't insert or delete instructions, as it would render the addresses
stored in the switch table invalid. I hope to fix this soon.

A number of changes have also been made to the aindump utility, since
these tools need to work together.

include/cJSON.h

@@ -277,6 +277,8 @@ CJSON_PUBLIC(double) cJSON_SetNumberHelper(cJSON *object, double number);
 /* Macro for iterating over an array or object */
 #define cJSON_ArrayForEach(element, array) for(element = (array != NULL) ? (array)->child : NULL; element != NULL; element = element->next)
 
+#define cJSON_ArrayForEachIndex(i, element, array) for(element = (array != NULL) ? (array)->child : NULL, i = 0; element != NULL; element = element->next, i++)
+
 /* malloc/free objects using the malloc/free functions that have been set with cJSON_InitHooks */
 CJSON_PUBLIC(void *) cJSON_malloc(size_t size);
 CJSON_PUBLIC(void) cJSON_free(void *object);