Add wireless receiver sensor

[libing64]

The wireless receiver sensor will publish the distance and angle of arrival information relative to the wireless transmitters in the world which can be used for wireless localization simulation.

[nicolaerosia]

In my opinion, it would be better to squash some patches, e.g. "still doesn't work" or "fix bug", to have a clean history as much as possible.

[libing64]

@nicolaerosia OK, I will do that.

[plumewind]

hello,
I use this:
<sensor name="uwb_wirelessReceiver" type="wireless_receiver"> <update_rate>1</update_rate> <transceiver> <min_frequency>2412.0</min_frequency> <max_frequency>2484.0</max_frequency> <power>14.5</power> <gain>2.5</gain> <sensitivity>-90.0</sensitivity> </transceiver> <plugin name="receiver_plugin" filename="libhector_gazebo_ros_wireless_receiver.so"> <always_on>1</always_on> <robotNamespace>/receiver_tag</robotNamespace> <frameId>/receiver_link</frameId> <topicName>/dists</topicName> </plugin> </sensor>

But got this:
[Wrn] [msgs.cc:1852] Conversion of sensor type[wireless_receiver] not supported.
[Wrn] [msgs.cc:1852] Conversion of sensor type[wireless_receiver] not supported.

Can you help me? thanks a lot