Adapted SimplifiedRadio to the new radio interface (step 7).

Replaced obsolete RadioState.
Removed enableReception/disableReception optimization.

This was incorrect because it ignored the fact that it takes time
for a radio frame travel to the radio.
Adapted Ieee80211Mac to the new radio interface (step 2).

Remove old radio state.
Added a new example that demonstrates different NIC configurations.

Contains 9 configurations for all combinations of
 - ideal, simplified and detailed radio models
 - ideal, BMAC, IEEE 802.11 mac models