[Tagging] Deprecating of leisure=common and leisure=village_green

[Marc Gemis]

> 1. If it is grass: tag it as grass
> 2. if it is a tree: tag it as a tree
> 3. if it is a hedge: tag it as a hedge
> 4. if it is a park: tag it as a park
> 5. if it is a flowerbed: tag it as a flowerbed
>
> and I now add:
>
> 6. if it is a garden: tag it as a garden
>

4 & 6 (park & garden) are on a different conceptual level as the others.
A park and garden can have grassy areas, trees, hedges, flowerbeds etc.

That is why garden and park are "leisure" keys and the rest should be
under the landcover tag.
For me, the landuse of a garden or park is "recreation".

m.