Support long airconditioner codes

The original code is designed to capture max. 100 symbol pairs. Split-unit air conditioner devices use much longer codes in their infrared protocol, for example Panasonic DKE series uses a code with 220 symbols. Even the Duemilanove can have an array for 400 pulse pairs, with its limited 2k of RAM.

Tested with Panasonic CKP & DKE and Fujitsu AWYZ remotes