Added hash mode 18500 sha1(md5(md5($pass)))

closes hashcat/hashcat#1652

include/interface.h

@@ -1397,6 +1397,7 @@ typedef enum kern_type
   KERN_TYPE_KRB5ASREP               = 18200,
   KERN_TYPE_APFS                    = 18300,
   KERN_TYPE_ODF12                   = 18400,
+  KERN_TYPE_SHA1_DOUBLE_MD5         = 18500,
   KERN_TYPE_PLAINTEXT               = 99999,
 
 } kern_type_t;