Implement Directions via Marker Drop or allow Long/Lat to be edited

[mathetos]

Currently, the only way to do Directions is via the Google Places Autocomplete tool. But if a user wants to do Directions between to points on a map that are NOT businesses they are stuck.

My hope would be that we could make this happen in one of two ways:

1. Use our "Drop a Marker" tool to create a Directions point. This would most likely provide the greatest flexibility since the marker could then be dragged to a new position.
2. Simply allow the long/lat to be edited and the Directions marker updated from the new data.

Here's the customer request that provoked this idea: https://secure.helpscout.net/conversation/359406544/7418/?folderId=672189