Add orthogonal drawing mode
|Reported by:||stoecker||Owned by:||team|
Much like drawing mode, but with some changes.
- Only for drawing closed ways
- first way segment gives direction. All following segments muste be in steps of 45 degree related to first segment.
- SHIFT-keypress allows unaligned way segments (for non orthogonal parts like roundings)
- drawing is finished when clicking last node again.
- aborting drawing removes entire object, not only the last segment.
Optionally support tagging new object as "building=yes".