Check for OSM lifecycle status "proposed" instead of "planned"

Created by: das-g

Check for OSM lifecycle status "proposed" instead of "planned" or treat them as synonyms.

See https://wiki.openstreetmap.org/wiki/Lifecycle_prefix#Common_lifecycle_prefixes

OSM object count as of 2016-05-31:

• planned=*: 846 (532 of which are ways)
• planned: key prefix: 3 005
• highway=planned: 267 (266 of which are ways)
• railway=planned: 31 (11 of which are ways)

Contrast to:

• proposed=*: 41 405 (39 994 of which are ways)
• proposed: key prefix: > 21 000
• highway=proposed: 54 135 (53 745 of which are ways)
• railway=proposed: 4 058 (3 614 of which are ways)