Lowline flow

• many misc UI bugfixes, especially for high-DPI screens
• managing turns across multiple nearby intersections: tool to visualize, handling multi-way OSM turn restrictions, using this to ban illegal movements at the pathfinding layer, starting a traffic signal editor variant to edit these
• rendering improvements: unzoomed agent size, visualizing routes on trip table, transparent roads beneath bridges, draw harbor island
• overhauled street/address finder
• parking mapper: shortcut to open bing