Deleted some obsolete (due to moves and new radio interface) files.
Adapted SimplifiedRadio to the new radio interface (step 6).

Added updateRadioChannelState.
Refactored changeChannel into setRadioChannel according to interface.
Removed obsolete channelNo signal.
Moved radio registration earlier.
Adapted Ieee80211Mac to the new radio interface (stage 1).

Added radioType to Ieee80211Nic to allow using different radios.
Adapted SimplifiedRadio to the new radio interface (step 7).

Replaced obsolete RadioState.
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