Recognise more surface types, treat fine_gravel as "formed" by default

[pastk]

• closes Pedestrian paths with "surface=brick" are displayed as unpaved #8231
• closes footway with surface=fine_gravel should not be converted to path #8029

[pastk]

@vng please review when you have time

[vng]

UPD: For future, please, add path<->footway transformation tests in osm_type_tests.cpp
For better understanding like input tags -> highway=path/footway as a result.

[pastk]

UPD: For future, please, add path<->footway transformation tests in osm_type_tests.cpp For better understanding like input tags -> highway=path/footway as a result.

Yeap there is a OsmType_HighwayTypesConversion section already, its just it doesn't make sense to add all possible surface values there.