v0.1.4

Major changes:

New vignette on street networks and time-based routing
weight_streetnet function now returns edge times for all Open Street Map networks extracted with the osmdata package.
weight_streetnet now accepts SC format data from osmdata::osmdata_sc()
New dodgr_times function to calculate journey times, including differential speeds and penalties for intersections and traffic lights.
dodgr::weighting_profiles data changed from single data.frame to list with additional parameters determining speeds and time penalties for dodgr_times function; former data.frame is now
dodgr::weighting_profiles$weighting_profiles.
New function write_dodgr_wt_profile writes full profile to local .json file for editing and subsequent use via weight_streetnet(wt_profile_file=<local_file_name.json>)`.
dodgr_dists(), dodgr_paths(), and dodgr_flows() can no longer be used to automatically download street networks, thus former parameters wt_profile and expand have been removed; networks must be explicitly
downloaded with dodgr_streetnet().

Minor changes:

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