IR Protocol Suggestion

[AndruePeters]

I'm not creating a pull request because it's such a small thing to do, but I thought it was worth suggesting. I first saw this used while doing some TI development.

Currently you have

`#define UNKNOWN 0
#define NEC 1
...
#define LAST_PROTOCOL 12 // Be sure to update this`

What you can do instead is

enum {
UNKNOWN = 0,
NEC, 
SONY,
...
LAST_PROTOCOL
}

This will automatically update the value for LAST_PROTOCOL as well as provide a bit more structure. Since you're already using OOP paradigms with C++, then I'd also suggest enum classes. However, that would require rewriting some code. What I suggested shouldn't break anything and also make it less error prone.

[AndruePeters]

By keeping the enum anonymous, it shouldn't interfere with any of your existing code. I'd also request changing the names of the protocols or namespace because they've interfered with other projects.