FSL-style expressions can use unidecode data to smash case and diacritics (#197)

* Read unidecode data, do some plumbing of it

* More unidecode plumbing

* Do the unidecode smashing, but it doesn't seem to be working

* Ah, that's better!

* Add missing header

* And reorder the includes too

* Shortcut when there is no unidecode data to work with

* Update version and changelog

* Avoid repeated unidecode smashing of the same constant string

jsonpull/jsonpull.c

@@ -755,6 +755,7 @@ again:
 		json_object *s = add_object(j, JSON_STRING);
 		if (s != NULL) {
 			s->value.string.string = val.buf;
+			s->value.string.refcon = NULL;
 		} else {
 			string_free(&val);
 		}

jsonpull/jsonpull.h

@@ -38,6 +38,7 @@ typedef struct json_object {
 
 		struct {
 			char *string;
+			void *refcon;  // reference constant for caller's use
 		} string;
 
 		struct {