rendering of rocks

[quantenschaum]

Currently rock are rendered as shown in https://wiki.openstreetmap.org/wiki/Tag:seamark:type%3Drock. This is fine, the 3 symbols are those defined in the INT1 for covering, awash and submerged (seamark:rock:water_level) rocks.

But there is more data that can be attached to a rock and should be shown on a nautical chart.

1. depth - number should be displayed in parentheses next to the rock (INT1 section K)
   
2. depth:exposition - The blue background and dotted line around the rock should only be displayed if it is outside it's surrounding depth contour (dangerous to surface navigation) depth:exposition=shoaler.
   

That would declutter the map and put emphasis on the dangerous rocks.

compare those

[quantenschaum]

osmandapp/OsmAnd#18092