Allow multiple protocols

[rnayabed]

Right now, rangoli is "hardwired" to use only one protocol, as the presence of multiple protocols was not known before.

Apparently, there are boards with multiple Vendor IDs (#13, #14, #22), and from the .pcap files seen in #13, it is assumed that the protocol used is different for models with different vendor ID.

Therefore, the code needs to be refactored to allow multiple protocols. This is currently halted, unless one of the protocols is sucessfully reverse engineered. Currently, only 0x258a boards' protocol is known.