[Tagging] antenna use key to replace some of the antenna type

[Warin]

Hi,

Following from my previous post on antenna:type ..


This is the first of the antenna:* keys that could be used to categorise 
various 'types' of antennas.


https://wiki.openstreetmap.org/wiki/Proposed_features/antenna:use


This one is on the use to which the antenna signal is put.


It does need input on the values. And anything else of concern naturally.