Feature/component fast clock

[jmvdwerf]

The fast clock component provides the fast_clock functionality to give loconet components an internal fast clock that reacts on the global fast clock messages, and in between keeps a clock ticking according to the global loconet clock settings. After each received fast clock message, the internal structure is updated.

[jmvdwerf]

Comments addressed!

[jmvdwerf]

I changed it to a fast_clock_loop function, but I find it ugly...