[PATCH] Support for natural=shrubbery

[JeroenHoek]

Minimal rendering for natural=shrubbery. This simply gives these shrubby areas the same area fill as natural=scrub to provide a base-line rendering preventing meaningless grey lines.

For more in-depth rendering of natural=shrubbery, including hints for vegetation density and height, a Map Paint Style is available.

The second patch ports my preset for this tag here.

[skyper]

As the numbers for natural=shrubbery are high enough to be picked up by a jenkins test, I guess it is time to create a default preset, too, which comes down to find or create an appropriate icon.

[JeroenHoek]

I can submit the preset I already have here: https://josm.openstreetmap.de/wiki/Presets/Greenery

I will do that in a separate issue. This one is just the minimal rendering.

[skyper]

I would appreciate a preset.Thanks in advance.