imap: Introduced IMAP_APPEND and IMAP_APPEND_FINAL states

lib/imap.c

@@ -468,6 +468,8 @@ static void state(struct connectdata *conn, imapstate newstate)
     "SELECT",
     "FETCH",
     "FETCH_FINAL",
+    "APPEND",
+    "APPEND_FINAL",
     "LOGOUT",
     /* LAST */
   };

lib/imap.h

@@ -48,6 +48,8 @@ typedef enum {
   IMAP_SELECT,
   IMAP_FETCH,
   IMAP_FETCH_FINAL,
+  IMAP_APPEND,
+  IMAP_APPEND_FINAL,
   IMAP_LOGOUT,
   IMAP_LAST          /* never used */
 } imapstate;