Radio signs can now be waxed to make them display-only;
Added support for multiple channels: /trigger radio set <channel number>;
No longer emit particles to reduce client lag;
Are now updated every 10 ticks instead of 1, to reduce server lag and imitate radio delay;
Now player can link a sign to the network while standing inside it with feet (head-level linking is still possible). Possible raycasting in the future?
