Accept 'Audio' as a valid entry type.

Also, done a tweak to read attributedTo fields that are a JSON object,
with the id in the "id" field (returned by bandwagon.fm).

activitypub.c

@@ -178,6 +178,11 @@ const char *get_atto(const xs_dict *msg)
             }
         }
     }
+    else
+    if (xs_type(actor) == XSTYPE_DICT) {
+        /* bandwagon.fm returns this */
+        actor = xs_dict_get(actor, "id");
+    }
 
     return actor;
 }

snac.h

@@ -32,7 +32,7 @@ extern int dbglevel;
 
 #define L(s) (s)
 
-#define POSTLIKE_OBJECT_TYPE "Note|Question|Page|Article|Video|Event"
+#define POSTLIKE_OBJECT_TYPE "Note|Question|Page|Article|Video|Audio|Event"
 
 int mkdirx(const char *pathname);