Add support of Toshiba Remote Control B

[jackysze]

Re-creation of the accidentally permanently closed PR, incorporated comments from @NiKiZe

The third byte in the raw state array originally represents payload length only. It was found that the first 4 bits is being used to identify whether current remote control is A or B. #2089

1. Modify the struct to accommodate both payload length and remote control type.
2. Add constants and functions to set/get current remote control type.
3. Fix the getInternalStateLength function to extract the last 4-bits instead using 8-bits.